diff --git a/common/static/common/scripts/app.js b/common/static/common/scripts/app.js
index e54772e0..67d8865c 100644
--- a/common/static/common/scripts/app.js
+++ b/common/static/common/scripts/app.js
@@ -95,20 +95,19 @@
   // Create function copyInstallUrl
   function copyInstallUrl() {
     function init() {
-      // Create variables
+      // Create variables single
       const btnInstall = document.querySelector('.js-btn-install');
       const btnInstallAction = document.querySelector('.js-btn-install-action');
       const btnInstallGroup = document.querySelector('.js-btn-install-group');
-      const btnInstallDrag = document.querySelector('.js-btn-install-drag');
-      const btnInstallDragGroup = document.querySelector('.js-btn-install-drag-group');
+
+      // Create variables multiple
+      const btnInstallActionItem = document.querySelectorAll('.js-btn-install-action-item');
 
       if (btnInstall == null) {
         return;
       }
 
-      // Get data install URL
-      const btnInstallUrl = btnInstall.getAttribute('data-install-url');
-
+      // Show btnInstallAction
       btnInstall.addEventListener('click', function() {
         // Hide btnInstallGroup
         btnInstallGroup.classList.add('d-none');
@@ -117,19 +116,28 @@
         btnInstallAction.classList.add('show');
       });
 
-      // Drag btnInstallUrl
-      btnInstallDrag.addEventListener('dragstart', function(e) {
-        // Set data install URL to be transferred during drag
-        e.dataTransfer.setData('text/plain', btnInstallUrl);
+      btnInstallActionItem.forEach(function(item) {
+        // Create variables in function scope
+        const btnInstallDrag = item.querySelector('.js-btn-install-drag');
+        const btnInstallDragGroup = item.querySelectorAll('.js-btn-install-drag-group');
 
-        // Set drag area active
-        btnInstallDragGroup.classList.add('opacity-50');
-      });
+        // Get data install URL
+        const btnInstallUrl = item.getAttribute('data-install-url');
 
-      // Undrag btnInstallUrl
-      btnInstallDrag.addEventListener('dragend', function() {
-        // Set drag area inactive
-        btnInstallDragGroup.classList.remove('opacity-50');
+        // Drag btnInstallUrl
+        btnInstallDrag.addEventListener('dragstart', function(e) {
+          // Set data install URL to be transferred during drag
+          e.dataTransfer.setData('text/plain', btnInstallUrl);
+
+          // Set drag area active
+          btnInstallDragGroup.classList.add('opacity-50');
+        });
+
+        // Undrag btnInstallUrl
+        btnInstallDrag.addEventListener('dragend', function() {
+          // Set drag area inactive
+          btnInstallDragGroup.classList.remove('opacity-50');
+        });
       });
     }
 
diff --git a/common/static/common/styles/_extension.sass b/common/static/common/styles/_extension.sass
index 33127a35..07826cca 100644
--- a/common/static/common/styles/_extension.sass
+++ b/common/static/common/styles/_extension.sass
@@ -164,6 +164,12 @@
   .btn-accent
     box-shadow: .2rem .8rem .8rem rgba(0,82,255,.102), 1.6rem 1.0rem 1.8rem rgba(0,82,255,.102), 3.2rem 1.0rem 3.2rem rgba(0,82,255,.349)
 
+  .btn-install-action-item
+    +margin(3, bottom)
+
+    &:last-child
+      +margin(0, bottom)
+
   .btn-install-drag,
   .btn-install-drag:active
     transform: initial
diff --git a/extensions/models.py b/extensions/models.py
index 0c02b5c8..b91390cd 100644
--- a/extensions/models.py
+++ b/extensions/models.py
@@ -7,7 +7,6 @@ from django.core.exceptions import ObjectDoesNotExist, BadRequest
 from django.db import models, transaction
 from django.db.models import Q, Count
 from django.urls import reverse
-from django.utils.functional import cached_property
 
 from common.fields import FilterableManyToManyField
 from common.model_mixins import CreatedModifiedMixin, RecordDeletionMixin, TrackChangesMixin
@@ -253,7 +252,9 @@ class Extension(CreatedModifiedMixin, TrackChangesMixin, models.Model):
 
     def update_metadata_from_version(self, version):
         update_fields = set()
-        metadata = version.file.metadata
+        files = list(version.files.all())
+        # picking the last uploaded file
+        metadata = files[-1].metadata
         # check if we can also update name
         # if we are uploading a new version, we have just validated and don't expect a clash,
         # but if a version is being deleted, we want to rollback to a name from an older version,
@@ -276,9 +277,9 @@ class Extension(CreatedModifiedMixin, TrackChangesMixin, models.Model):
 
         # TODO: check that latest version is currently in review (whatever that means in data?)
         latest_version = self.latest_version
-        file = latest_version.file
-        file.status = FILE_STATUS_CHOICES.APPROVED
-        file.save()
+        for file in latest_version.files.all():
+            file.status = FILE_STATUS_CHOICES.APPROVED
+            file.save()
 
         # TODO: check that this extension is currently in review (whatever that means in data?)
         self.previews.update(status=FILE_STATUS_CHOICES.APPROVED)
@@ -422,8 +423,12 @@ class Extension(CreatedModifiedMixin, TrackChangesMixin, models.Model):
         )
 
     def suspicious_files(self):
-        versions = self.versions.all()
-        return [v.file for v in versions if not v.file.validation.is_ok]
+        files = []
+        for version in self.versions.all():
+            for file in version.files.all():
+                if not file.validation.is_ok:
+                    files.append(file)
+        return files
 
     @classmethod
     def get_lookup_field(cls, identifier):
@@ -439,7 +444,8 @@ class Extension(CreatedModifiedMixin, TrackChangesMixin, models.Model):
         for version in versions:
             if skip_version and version == skip_version:
                 continue
-            if version.file.status not in self.valid_file_statuses:
+            files = version.files.all()
+            if not any([file.status in self.valid_file_statuses for file in files]):
                 continue
             latest_version = version
             break
@@ -667,25 +673,71 @@ class Version(CreatedModifiedMixin, TrackChangesMixin, models.Model):
     def __str__(self) -> str:
         return f'{self.extension} v{self.version}'
 
-    # TODO get rid of this once all places are aware of multi-file reality
-    #
-    # the fact that it is cached is important, this allows to use version.file as if it still was a
-    # model field, i.e. write things like
-    #   version.file.status = ...
-    #   version.file.save()
-    # if it isn't cached, then the save call is applied to a different, newly fetched File instance
-    @cached_property
-    def file(self):
-        files = list(self.files.all())
-        if files:
-            return files[0]
-        else:
-            return None
+    @property
+    def has_single_file(self):
+        return len(self.files.all()) == 1
+
+    def add_file(self, file: File):
+        current_platforms = set([p.slug for p in self.platforms.all()])
+        if not current_platforms:
+            raise ValueError(
+                f'add_file failed: Version pk={self.pk} is not platform-specific, '
+                f'no more files allowed'
+            )
+        file_platforms = set(file.get_platforms() or [])
+        if overlap := current_platforms & file_platforms:
+            raise ValueError(
+                f'add_file failed: File pk={file.pk} and Version pk={self.pk} have '
+                f'overlapping platforms: {overlap}'
+            )
+        self.files.add(file)
+        self.update_platforms()
+
+    @transaction.atomic
+    def update_platforms(self):
+        current_platforms = set([p.slug for p in self.platforms.all()])
+        files_platforms = set()
+        for file in self.files.all():
+            if file_platforms := file.get_platforms():
+                files_platforms.update(file_platforms)
+            else:
+                # we have a cross-platform file - version must not specify platforms
+                # other files should not exist (validation takes care of that),
+                # but here we won't double-check it (?)
+                if len(current_platforms):
+                    self.platforms.delete()
+                return
+        if to_create := files_platforms - current_platforms:
+            for p in to_create:
+                self.platforms.add(Platform.objects.get(slug=p))
+        if to_delete := current_platforms - files_platforms:
+            for p in to_delete:
+                self.platforms.remove(Platform.objects.get(slug=p))
+
+    def get_remaining_platforms(self):
+        all_platforms = set(p.slug for p in Platform.objects.all())
+        for file in self.files.all():
+            platforms = file.get_platforms()
+            if not platforms:
+                # no platforms means any platform
+                return set()
+            all_platforms -= set(platforms)
+        return all_platforms
+
+    def get_file_for_platform(self, platform):
+        for file in self.files.all():
+            platforms = file.get_platforms()
+            # not platform-specific, matches all platforms
+            if not platforms:
+                return file
+            if platform is None or platform in platforms:
+                return file
+        return None
 
     @property
     def is_listed(self):
-        # To be public, version file must have a public status.
-        return self.file.status == self.file.STATUSES.APPROVED
+        # To be public, at least one version file must have a public status.
+        return any([file.status == File.STATUSES.APPROVED for file in self.files.all()])
 
     @property
     def cannot_be_deleted_reasons(self) -> List[str]:
@@ -699,35 +751,41 @@ class Version(CreatedModifiedMixin, TrackChangesMixin, models.Model):
 
     @property
     def permissions_with_reasons(self) -> List[dict]:
-        """Returns permissions with reasons, slugs, and names to be shown in templates."""
-        if 'permissions' not in self.file.metadata:
-            return []
-        permissions = []
-        all_permission_names = {p.slug: p.name for p in VersionPermission.objects.all()}
-        for slug, reason in self.file.metadata['permissions'].items():
-            permissions.append({'slug': slug, 'reason': reason, 'name': all_permission_names[slug]})
+        """Returns permissions with reasons, slugs, and names to be shown in templates.
 
+        It might make sense to not aggregate at the Version level, and query directly from File.
+        If we ever restructure multi-platform UI, this method should be revisited.
+
+        Normally we can expect that all files have the same permissions, but checking all files,
+        just in case.
+        """
+        slug2reason = {}
+        for file in self.files.all():
+            if 'permissions' in file.metadata:
+                slug2reason.update(file.metadata['permissions'])
+
+        if not slug2reason:
+            return []
+
+        all_permission_names = {p.slug: p.name for p in VersionPermission.objects.all()}
+        permissions = []
+        for slug, reason in slug2reason.items():
+            permissions.append({'slug': slug, 'reason': reason, 'name': all_permission_names[slug]})
         return permissions
 
-    @property
-    def download_name(self) -> str:
+    def _get_download_name(self, file) -> str:
         """Return a file name for downloads."""
-        replace_char = f'{self}'.replace('.', '-')
-        return f'{utils.slugify(replace_char)}{self.file.suffix}'
+        parts = [self.extension.type_slug_singular, self.extension.slug, f'v{self.version}']
+        if platforms := file.get_platforms():
+            parts.extend(platforms)
+        return f'{"-".join(parts)}.zip'
 
-    @property
-    def downloadable_signed_url(self) -> str:
-        # TODO: actual signed URLs?
-        return self.file.source.url
-
-    def download_url(self, append_repository_and_compatibility=True) -> str:
-        filename = f'{self.extension.type_slug_singular}-{self.extension.slug}-v{self.version}.zip'
+    def get_download_url(self, file, append_repository_and_compatibility=True) -> str:
+        filename = self._get_download_name(file)
         download_url = reverse(
-            'extensions:version-download',
+            'extensions:download',
             kwargs={
-                'type_slug': self.extension.type_slug,
-                'slug': self.extension.slug,
-                'version': self.version,
+                'filehash': file.hash,
                 'filename': filename,
             },
         )
@@ -738,12 +796,57 @@ class Version(CreatedModifiedMixin, TrackChangesMixin, models.Model):
             }
             if self.blender_version_max:
                 params['blender_version_max'] = self.blender_version_max
-            if platforms := self.platforms.all():
-                params['platforms'] = ','.join([p.slug for p in platforms])
+            if platforms := file.get_platforms():
+                params['platforms'] = ','.join(platforms)
             query_string = urlencode(params)
             download_url += f'?{query_string}'
         return download_url
 
+    def get_download_list(self) -> List[dict]:
+        files = list(self.files.all())
+        if len(files) == 1:
+            file = files[0]
+            return [
+                {
+                    'name': self._get_download_name(file),
+                    'size': file.size_bytes,
+                    'url': self.get_download_url(file),
+                }
+            ]
+        platform2file = {}
+        for file in files:
+            platforms = file.get_platforms()
+            if not platforms:
+                log.warning(
+                    f'data error: Version pk={self.pk} has multiple files, but File pk={file.pk} '
+                    f'is not platform-specific'
+                )
+            for platform in platforms:
+                platform2file[platform] = file
+        return [
+            {
+                'name': self._get_download_name(file),
+                'platform': p,
+                'size': file.size_bytes,
+                'url': self.get_download_url(file),
+            }
+            for p, file in platform2file.items()
+        ]
+
+    def get_build_list(self) -> List[dict]:
+        build_list = []
+        for file in self.files.all():
+            platforms = file.get_platforms() or []
+            build_list.append(
+                {
+                    'name': self._get_download_name(file),
+                    'platforms': platforms,
+                    'size': file.size_bytes,
+                    'url': self.get_download_url(file),
+                }
+            )
+        return build_list
+
     def get_delete_url(self) -> str:
         return reverse(
             'extensions:version-delete',
diff --git a/extensions/signals.py b/extensions/signals.py
index f088cfbd..4840604d 100644
--- a/extensions/signals.py
+++ b/extensions/signals.py
@@ -43,10 +43,19 @@ def _delete_versionfiles_file(
     logger.info('Deleting File pk=%s of VersionFile pk=%s', file.pk, instance.pk)
     file.delete()
 
-    if instance.version.files.count() == 0:
-        # this was the last file, clean up the version
-        logger.info('Deleting Version pk=%s because its last file was deleted', instance.version.pk)
-        instance.version.delete()
+    # this code is already quite convoluted :double-facepalm:
+    # TODO? maybe find some way to have a predictable order of deletion
+    try:
+        instance.version.update_platforms()
+        if instance.version.files.count() == 0:
+            # this was the last file, clean up the version
+            logger.info(
+                'Deleting Version pk=%s because its last file was deleted',
+                instance.version.pk,
+            )
+            instance.version.delete()
+    except extensions.models.Version.DoesNotExist:
+        pass
 
 
 @receiver(pre_save, sender=extensions.models.Extension)
diff --git a/extensions/templates/extensions/components/extension_edit_detail_card.html b/extensions/templates/extensions/components/extension_edit_detail_card.html
index 89b3b009..928b8a24 100644
--- a/extensions/templates/extensions/components/extension_edit_detail_card.html
+++ b/extensions/templates/extensions/components/extension_edit_detail_card.html
@@ -69,7 +69,13 @@
           </div>
           <div class="dl-col">
             <dt>{% trans 'Size' %}</dt>
-            <dd>{{ version.file.size_bytes|filesizeformat }}</dd>
+            {% if version.has_single_file %}
+            <dd>{{ version.files.first.size_bytes|filesizeformat }}</dd>
+            {% else %}
+            {% for file in version.files.all %}
+            <dd>{{ file.size_bytes|filesizeformat }} ({{ file.get_platforms|join:", " }})</dd>
+            {% endfor %}
+            {% endif %}
           </div>
         </div>
 
diff --git a/extensions/templates/extensions/components/platforms.html b/extensions/templates/extensions/components/platforms.html
index 037a84d1..ef77985f 100644
--- a/extensions/templates/extensions/components/platforms.html
+++ b/extensions/templates/extensions/components/platforms.html
@@ -1,10 +1,16 @@
+{% load i18n %}
+
 {% if version.platforms.all %}
-<div>
-  Supported platforms:
-  <ul>
-  {% for p in version.platforms.all %}
-    <li>{{p.name}}</li>
-  {% endfor %}
-  </ul>
-</div>
+  <div class="dl-row">
+    <div class="dl-col">
+      <dt>{% trans "Supported Platforms" %}</dt>
+      <dd>
+        <ul class="mb-0 ps-3">
+          {% for p in version.platforms.all %}
+            <li>{{p.name}}</li>
+          {% endfor %}
+        </ul>
+      </dd>
+    </div>
+  </div>
 {% endif %}
diff --git a/extensions/templates/extensions/detail.html b/extensions/templates/extensions/detail.html
index 2c0e9936..6d939420 100644
--- a/extensions/templates/extensions/detail.html
+++ b/extensions/templates/extensions/detail.html
@@ -187,7 +187,20 @@
                 </div>
                 <div class="dl-col">
                   <dt>{% trans 'Size' %}</dt>
-                  <dd>{{ latest.file.size_bytes|filesizeformat }}</dd>
+                  {% if latest.has_single_file %}
+                    <dd>{{ latest.files.first.size_bytes|filesizeformat }}</dd>
+                  {% else %}
+                    <dd>
+                      <ul class="ps-3">
+                        {% for file in latest.files.all %}
+                          <li class="lh-sm">
+                            {{ file.size_bytes|filesizeformat }}<br>
+                            <span class="fs-sm text-muted">({{ file.get_platforms|join:", " }})</span>
+                          </li>
+                        {% endfor %}
+                      </ul>
+                    </dd>
+                  {% endif %}
                 </div>
               </div>
 
@@ -196,11 +209,12 @@
                   <dt>{% trans 'Compatibility' %}</dt>
                   <dd>
                     {% include "extensions/components/blender_version.html" with version=latest %}
-                    {% include "extensions/components/platforms.html" with version=latest %}
                   </dd>
                 </div>
               </div>
 
+              {% include "extensions/components/platforms.html" with version=latest %}
+
               {% if extension.website %}
               <div class="dl-row">
                 <div class="dl-col">
@@ -250,37 +264,45 @@
         {% block extension_download %}
         <section class="ext-detail-download mt-3">
         {% if extension.is_approved %}
+        {% with download_list=latest.get_download_list %}
           <div class="btn-group js-btn-install-group">
-            <button class="btn btn-flex btn-accent js-btn-install" data-install-url="{{ request.scheme }}://{{ request.get_host }}{{ latest.download_url }}">
+            <button class="btn btn-flex btn-accent js-btn-install">
               <span>{% trans 'Get' %} {{ extension.get_type_display }}</span>
             </button>
           </div>
           <div class="fade js-btn-install-action">
-            <div class="btn-install-drag-group js-btn-install-drag-group mb-2 rounded">
-              <button class="btn btn-flex btn-primary btn-install-drag cursor-move js-btn-install-drag w-100" draggable="true">
-                <i class="i-move"></i>
-                <span>{% trans 'Drag and Drop into Blender' %}</span>
-              </button>
-            </div>
-            <small class="d-block text-center w-100">
-              {# TODO @front-end: Replace URL of the manual /dev/ with /latest/. #}
-              ...or <a class="text-underline text-primary" href="{{ request.scheme }}://{{ request.get_host }}{{ latest.download_url }}" download="{{ latest.download_name }}">download</a>
-              and <a class="text-underline text-primary" href="https://docs.blender.org/manual/en/dev/editors/preferences/extensions.html#install" target="_blank">Install from Disk</a>
-            </small>
+            {% for download_item in download_list %}
+              <div class="btn-install-action-item js-btn-install-action-item" data-install-url="{{ request.scheme }}://{{ request.get_host }}{{ download_item.url }}" download="{{ download_item.name }}">
+                <div class="btn-install-drag-group js-btn-install-drag-group mb-2 rounded">
+                  <button class="btn btn-flex btn-primary btn-install-drag cursor-move js-btn-install-drag w-100" draggable="true">
+                    <i class="i-move"></i>
+                    <span>{% trans 'Drag and Drop into Blender' %} <span class="fs-sm">{{ download_item.platform }}</span></span>
+                  </button>
+                </div>
+                <small class="d-block text-center w-100">
+                  {# TODO @front-end: Replace URL of the manual /dev/ with /latest/. #}
+                  ...or <a class="text-underline text-primary" href="{{ request.scheme }}://{{ request.get_host }}{{ download_item.url }}" download="{{ download_item.name }}">download</a>
+                  and <a class="text-underline text-primary" href="https://docs.blender.org/manual/en/dev/editors/preferences/extensions.html#install" target="_blank">Install from Disk</a>
+                </small>
+              </div>
+            {% endfor %}
           </div>
 
           {# If JavaScript is disabled. #}
           <noscript>
             <style>.js-btn-install-group { display: none;}</style>
             <div class="btn-col text-center">
-              <a class="btn btn-flex btn-accent" href="{{ request.scheme }}://{{ request.get_host }}{{ latest.download_url }}" download="{{ latest.download_name }}">
-                <i class="i-download"></i><span>{% trans 'Download' %} {{ extension.get_type_display }}</span>
+              {% for download_item in download_list %}
+              <a class="btn btn-flex btn-accent" href="{{ request.scheme }}://{{ request.get_host }}{{ download_item.url }}" download="{{ download_item.name }}">
+                <i class="i-download"></i><span>{% trans 'Download' %} {{ extension.get_type_display }} {{ download_item.platform }}</span>
               </a>
               <small class="mt-3">...and <a class="text-underline text-primary text-center" href="https://docs.blender.org/manual/en/dev/editors/preferences/extensions.html#install" target="_blank">Install from Disk</a></small>
+              {% endfor %}
             </div>
           </noscript>
 
-          {% else %}
+        {% endwith %}
+        {% else %}
           <div class="card p-3 mt-3">
             <p class="text-info">This {{ extension.get_type_display|lower }} is currently under review.</p>
             <p>
@@ -290,7 +312,7 @@
               <span>{% trans 'Review Extension' %}</span>
             </a>
           </div>
-          {% endif %}
+        {% endif %}
         </section>
         {% endblock extension_download %}
       </aside>
diff --git a/extensions/templates/extensions/manage/update.html b/extensions/templates/extensions/manage/update.html
index 640ff645..69dbf2b4 100644
--- a/extensions/templates/extensions/manage/update.html
+++ b/extensions/templates/extensions/manage/update.html
@@ -3,7 +3,7 @@
 {% block page_title %}{{ extension.name }}{% endblock page_title %}
 
 {% block content %}
-{% with author=extension.latest_version.file.user form=form|add_form_classes %}
+{% with form=form|add_form_classes %}
 <div class="row">
   <div class="col-md-8">
     <h2>{{ extension.get_type_display }} {% trans 'details' %}</h2>
diff --git a/extensions/templates/extensions/new_version_finalise.html b/extensions/templates/extensions/new_version_finalise.html
index 13881e18..7681164e 100644
--- a/extensions/templates/extensions/new_version_finalise.html
+++ b/extensions/templates/extensions/new_version_finalise.html
@@ -16,11 +16,7 @@
             {% csrf_token %}
             {% with form=form|add_form_classes %}
 
-            <h2>
-              {% blocktranslate with version=form.instance.version %}
-                v{{ version }}
-              {% endblocktranslate %}
-            </h2>
+            <h2>v{{ form.instance.version }}</h2>
 
             <section class="card p-3">
               <div class="row">
@@ -39,6 +35,21 @@
               </div>
               {% endif %}
             </section>
+            <section class="card p-3 mt-4">
+              {% trans 'Builds' %}:
+              {% with build_list=form.instance.get_build_list %}
+              <div class="btn-col">
+              {% for build in build_list %}
+                <a href="{{ build.url }}" download="{{ build.name }}" class="btn btn-danger btn-block">
+                  <i class="i-download"></i>
+                  <span>
+                    {% trans 'Download' %} v{{ form.instance.version }} {{ build.platforms|join:", " }}
+                  </span>
+                </a>
+              {% endfor %}
+              {% endwith %}
+              </div>
+            </section>
           </div>
           <div class="col-md-4">
             <div class="is-sticky">
diff --git a/extensions/templates/extensions/submit.html b/extensions/templates/extensions/submit.html
index e896a7bd..50d07611 100644
--- a/extensions/templates/extensions/submit.html
+++ b/extensions/templates/extensions/submit.html
@@ -23,9 +23,11 @@
           {% trans 'Upload Extension' %}
           {% endif %}
         </h1>
+        {% if extension %}
         <p>
           <a href="{{ extension.get_absolute_url }}"><strong>{{ extension.name }}</strong></a>
         </p>
+        {% endif %}
         <hr>
         {% if not extension and drafts %}
         <div>
diff --git a/extensions/templates/extensions/version_list.html b/extensions/templates/extensions/version_list.html
index 2182aba1..1cf6a52d 100644
--- a/extensions/templates/extensions/version_list.html
+++ b/extensions/templates/extensions/version_list.html
@@ -21,7 +21,7 @@
 
   <div class="row ext-version-history pb-3">
     <div class="col">
-      {% for version in extension.versions.all %}
+      {% for version in object_list %}
         {% if version.is_listed or is_maintainer %}
         <details {% if forloop.counter == 1 %}open{% endif %} id="v{{ version.version|slugify }}">
           <summary>
@@ -30,7 +30,13 @@
               {% include "extensions/components/blender_version.html" with version=version %}
             </span>
             <ul class="ms-auto">
-              <li class="show-on-collapse">{{ version.file.size_bytes|filesizeformat }}</li>
+              {% if version.has_single_file %}
+              <li class="show-on-collapse">{{ version.files.first.size_bytes|filesizeformat }}</li>
+              {% else %}
+              {% for file in version.files.all %}
+              <li class="show-on-collapse">{{ file.size_bytes|filesizeformat }} ({{ file.get_platforms|join:", " }})</li>
+              {% endfor %}
+              {% endif %}
               <li class="show-on-collapse"><i class="i-download"></i> {{ version.download_count }}</li>
               <li>
                 <a href="#v{{ version.version|slugify }}" title="{% firstof version.date_approved|date:'l jS, F Y - H:i' version.date_created|date:'l jS, F Y - H:i' %}">
@@ -58,10 +64,12 @@
                     <dt>{% trans 'Compatibility' %}</dt>
                     <dd>
                       {% include "extensions/components/blender_version.html" with version=version %}
-                      {% include "extensions/components/platforms.html" with version=version %}
                     </dd>
                   </div>
                 </div>
+
+                {% include "extensions/components/platforms.html" with version=version %}
+
                 <div class="dl-row">
                   <div class="dl-col">
                     <dt>Downloads</dt>
@@ -69,7 +77,13 @@
                   </div>
                   <div class="dl-col">
                     <dt>Size</dt>
-                    <dd>{{ version.file.size_bytes|filesizeformat }}</dd>
+                    {% if version.has_single_file %}
+                    <dd>{{ version.files.first.size_bytes|filesizeformat }}</dd>
+                    {% else %}
+                    {% for file in version.files.all %}
+                    <dd>{{ file.size_bytes|filesizeformat }} ({{ file.get_platforms|join:", " }})</dd>
+                    {% endfor %}
+                    {% endif %}
                   </div>
                 </div>
                 <div class="dl-row">
@@ -91,17 +105,22 @@
                 <div class="dl-row">
                   <div class="dl-col">
                     <dt>Status</dt>
-                    <dd>{% include "common/components/status.html" with object=version.file %}</dd>
+                    {# all files of a version get approved together #}
+                    <dd>{% include "common/components/status.html" with object=version.files.first %}</dd>
                   </div>
                 </div>
                 {% endif %}
               </section>
 
               <div class="btn-col">
-                <a href="{{ version.download_url }}" download="{{ version.download_name }}" class="btn btn-primary btn-block">
+                {% with download_list=version.get_download_list %}
+                {% for download_item in download_list %}
+                <a href="{{ download_item.url }}" download="{{ download_item.name }}" class="btn btn-primary btn-block">
                   <i class="i-download"></i>
-                  <span>{% trans 'Download' %} v{{ version.version }}</span>
+                  <span>{% trans 'Download' %} v{{ version.version }} {{ download_item.platform }}</span>
                 </a>
+                {% endfor %}
+                {% endwith %}
                 {% if is_maintainer %}
                 <a href="{{ version.update_url }}" class="btn">
                   <i class="i-edit"></i><span>Edit</span>
diff --git a/extensions/tests/files/addon-with-split-platforms.zip b/extensions/tests/files/addon-with-split-platforms-linux.zip
similarity index 100%
rename from extensions/tests/files/addon-with-split-platforms.zip
rename to extensions/tests/files/addon-with-split-platforms-linux.zip
diff --git a/extensions/tests/files/addon-with-split-platforms-windows.zip b/extensions/tests/files/addon-with-split-platforms-windows.zip
new file mode 100644
index 00000000..37a5a828
Binary files /dev/null and b/extensions/tests/files/addon-with-split-platforms-windows.zip differ
diff --git a/extensions/tests/files/addon-without-platforms-for-split-test.zip b/extensions/tests/files/addon-without-platforms-for-split-test.zip
new file mode 100644
index 00000000..f3df336a
Binary files /dev/null and b/extensions/tests/files/addon-without-platforms-for-split-test.zip differ
diff --git a/extensions/tests/test_api.py b/extensions/tests/test_api.py
index da38b708..0ec1fc07 100644
--- a/extensions/tests/test_api.py
+++ b/extensions/tests/test_api.py
@@ -5,8 +5,9 @@ from django.urls import reverse
 from rest_framework import status
 from rest_framework.test import APITestCase, APIClient
 
-from common.tests.factories.users import UserFactory
 from common.tests.factories.extensions import create_approved_version, create_version
+from common.tests.factories.files import FileFactory
+from common.tests.factories.users import UserFactory
 from common.tests.utils import create_user_token
 
 from extensions.models import Extension, Version
@@ -48,8 +49,9 @@ class ListedExtensionsTest(APITestCase):
         self.assertEqual(self._listed_extensions_count(), 0)
 
     def test_moderate_only_version(self):
-        self.version.file.status = File.STATUSES.DISABLED
-        self.version.file.save()
+        for file in self.version.files.all():
+            file.status = File.STATUSES.DISABLED
+            file.save()
         self.assertEqual(self._listed_extensions_count(), 0)
 
 
@@ -150,6 +152,66 @@ class FiltersTest(APITestCase):
         ).json()
         self.assertEqual(len(json['data']), 1)
 
+    def test_platform_filter_same_extension(self):
+        version = create_approved_version(
+            metadata__platforms=['linux-x64'],
+            metadata__version='1.0.0',
+        )
+        extension = version.extension
+        version = create_approved_version(
+            extension=extension,
+            metadata__platforms=['windows-x64'],
+            metadata__version='1.0.1',
+        )
+
+        url = reverse('extensions:api')
+        json = self.client.get(
+            url + '?platform=linux-x64',
+            HTTP_ACCEPT='application/json',
+        ).json()
+        self.assertEqual(len(json['data']), 1)
+
+        json = self.client.get(
+            url + '?platform=windows-x64',
+            HTTP_ACCEPT='application/json',
+        ).json()
+        self.assertEqual(len(json['data']), 1)
+
+    def test_platform_filter_same_version(self):
+        version = create_approved_version(
+            metadata__id='filter_test',
+            metadata__platforms=['linux-x64'],
+            metadata__version='1.0.0',
+        )
+        version = version.add_file(
+            FileFactory(
+                metadata__id='filter_test',
+                metadata__platforms=['windows-x64'],
+                metadata__version='1.0.0',
+            )
+        )
+
+        url = reverse('extensions:api')
+        json = self.client.get(
+            url + '?platform=linux-x64',
+            HTTP_ACCEPT='application/json',
+        ).json()
+        self.assertEqual(len(json['data']), 1)
+
+        json = self.client.get(
+            url + '?platform=windows-x64',
+            HTTP_ACCEPT='application/json',
+        ).json()
+        self.assertEqual(len(json['data']), 1)
+
+        json = self.client.get(
+            url,
+            HTTP_ACCEPT='application/json',
+        ).json()
+        self.assertEqual(len(json['data']), 2)
+        # all archive_url values should be unique
+        self.assertEqual(len(json['data']), len(set(item['archive_url'] for item in json['data'])))
+
     def test_blender_version_filter_latest_not_max_version(self):
         version = create_approved_version(metadata__blender_version_min='4.0.1')
         date_created = version.date_created
@@ -238,7 +300,8 @@ class VersionUploadAPITest(APITestCase):
         self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
         self.assertEqual(
             response.data['message'],
-            f'Extension "{other_extension.extension_id}" not maintained by user "{self.user.username}"',
+            f'Extension "{other_extension.extension_id}" not maintained by user '
+            f'"{self.user.username}"',
         )
 
     def test_version_upload_extension_does_not_exist(self):
@@ -288,3 +351,59 @@ class VersionUploadAPITest(APITestCase):
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.token.refresh_from_db()
         self.assertIsNotNone(self.token.date_last_access)
+
+    def test_multiplatform_upload(self):
+        extension = create_version(
+            metadata__id="some_addon",
+            metadata__version="0.0.1",
+            user=self.user,
+        ).extension
+        file_linux = TEST_FILES_DIR / 'addon-with-split-platforms-linux.zip'
+        file_windows = TEST_FILES_DIR / 'addon-with-split-platforms-windows.zip'
+
+        with open(file_linux, 'rb') as version_file:
+            response = self.client.post(
+                self._get_upload_url('some_addon'),
+                {
+                    'version_file': version_file,
+                    'release_notes': 'only linux',
+                },
+                format='multipart',
+                HTTP_AUTHORIZATION=f'Bearer {self.token_key}',
+            )
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED, response.json())
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.files.count(), 1)
+        self.assertEqual(extension.latest_version.platforms.count(), 1)
+
+        with open(file_windows, 'rb') as version_file:
+            response = self.client.post(
+                self._get_upload_url('some_addon'),
+                {
+                    'version_file': version_file,
+                    'release_notes': 'linux and windows',
+                },
+                format='multipart',
+                HTTP_AUTHORIZATION=f'Bearer {self.token_key}',
+            )
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED, response.json())
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.release_notes, 'linux and windows')
+        self.assertEqual(extension.latest_version.files.count(), 2)
+        self.assertEqual(extension.latest_version.platforms.count(), 2)
+
+        with open(file_windows, 'rb') as version_file:
+            response = self.client.post(
+                self._get_upload_url('some_addon'),
+                {
+                    'version_file': version_file,
+                    'release_notes': 'linux and windows',
+                },
+                format='multipart',
+                HTTP_AUTHORIZATION=f'Bearer {self.token_key}',
+            )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST, response.json())
+        self.assertEqual(
+            response.data['message']['version_file'],
+            [f'{extension.latest_version} already has files for windows-x64'],
+        )
diff --git a/extensions/tests/test_approve.py b/extensions/tests/test_approve.py
index f438f316..2bd00de9 100644
--- a/extensions/tests/test_approve.py
+++ b/extensions/tests/test_approve.py
@@ -26,7 +26,7 @@ class ApproveExtensionTest(TestCase):
 
         # latest_version of approved extension must be listed
         # check that we rollback latest_version when file is not approved
-        file = new_version.file
+        file = new_version.files.first()
         file.status = File.STATUSES.AWAITING_REVIEW
         file.save(update_fields={'status'})
         new_version.refresh_from_db()
@@ -36,8 +36,9 @@ class ApproveExtensionTest(TestCase):
         self.assertTrue(extension.is_listed)
 
         # break the first_version, check that nothing is listed anymore
-        first_version.file.status = File.STATUSES.AWAITING_REVIEW
-        first_version.file.save()
+        file = first_version.files.first()
+        file.status = File.STATUSES.AWAITING_REVIEW
+        file.save()
         self.assertFalse(first_version.is_listed)
         extension.refresh_from_db()
         self.assertFalse(extension.is_listed)
diff --git a/extensions/tests/test_delete.py b/extensions/tests/test_delete.py
index fda39d5e..815dd6dd 100644
--- a/extensions/tests/test_delete.py
+++ b/extensions/tests/test_delete.py
@@ -43,7 +43,7 @@ class DeleteTest(TestCase):
                 source='images/b0/b03fa981527593fbe15b28cf37c020220c3d83021999eab036b87f3bca9c9168.png',
             )
         )
-        version_file = version.file
+        version_file = version.files.first()
         icon = extension.icon
         featured_image = extension.featured_image
         self.assertEqual(version_file.get_status_display(), 'Awaiting Review')
@@ -216,3 +216,14 @@ class DeleteTest(TestCase):
 
         self.assertEqual(response.status_code, 403)
         extension.refresh_from_db()
+
+    def test_multi_file_version_delete(self):
+        version = create_version(metadata__platforms=['linux-x64'])
+        version.add_file(
+            FileFactory(
+                metadata__id=version.extension.extension_id,
+                metadata__version=version.version,
+                metadata__platforms=['windows-x64'],
+            )
+        )
+        version.extension.delete()
diff --git a/extensions/tests/test_manifest.py b/extensions/tests/test_manifest.py
index 4691d900..5458492c 100644
--- a/extensions/tests/test_manifest.py
+++ b/extensions/tests/test_manifest.py
@@ -186,7 +186,7 @@ class ValidateManifestTest(CreateFileTest):
         self.assertEqual(Extension.objects.count(), 1)
 
         # The same author is to send a new version to thte same extension
-        self.client.force_login(version.file.user)
+        self.client.force_login(version.files.first().user)
 
         non_kitsu_1_6 = {
             "name": "Blender Kitsu with a different ID",
@@ -213,7 +213,7 @@ class ValidateManifestTest(CreateFileTest):
         self.assertEqual(Extension.objects.count(), 1)
 
         # The same author is to send a new version to thte same extension
-        self.client.force_login(version.file.user)
+        self.client.force_login(version.files.first().user)
 
         kitsu_version_clash = {
             "name": "Change the name for lols",
@@ -254,7 +254,7 @@ class ValidateManifestTest(CreateFileTest):
         )
 
         # The same author is to send a new version to thte same extension
-        self.client.force_login(version.file.user)
+        self.client.force_login(version.files.first().user)
 
         updated_kitsu = {
             "name": version.extension.name,
@@ -692,7 +692,7 @@ class VersionPermissionsTest(CreateFileTest):
         self.assertEqual(version_original, extension.latest_version)
 
         # The same author is to send a new version to the same extension but with a new permission
-        self.client.force_login(version_original.file.user)
+        self.client.force_login(version_original.files.first().user)
 
         new_kitsu = {
             "id": "blender_kitsu",
diff --git a/extensions/tests/test_models.py b/extensions/tests/test_models.py
index c2f17e5e..84c4e541 100644
--- a/extensions/tests/test_models.py
+++ b/extensions/tests/test_models.py
@@ -5,7 +5,9 @@ from django.test import TestCase
 from common.admin import get_admin_change_path
 from common.log_entries import entries_for
 from common.tests.factories.extensions import create_version
+from common.tests.factories.files import FileFactory
 from common.tests.factories.users import UserFactory
+from extensions.models import Platform
 
 
 class ExtensionTest(TestCase):
@@ -70,19 +72,16 @@ class VersionTest(TestCase):
     maxDiff = None
     fixtures = ['dev', 'licenses']
 
-    def setUp(self):
-        super().setUp()
-        self.version = create_version(
+    def test_admin_change_view(self):
+        version = create_version(
             metadata__blender_version_min='2.83.1',
             metadata__name='Extension name',
             metadata__support='https://example.com/',
             metadata__version='1.1.2',
             metadata__website='https://example.com/',
         )
-        self.assertEqual(entries_for(self.version).count(), 0)
-
-    def test_admin_change_view(self):
-        path = get_admin_change_path(obj=self.version)
+        self.assertEqual(entries_for(version).count(), 0)
+        path = get_admin_change_path(obj=version)
         self.assertEqual(path, '/admin/extensions/version/1/change/')
 
         admin_user = UserFactory(is_staff=True, is_superuser=True)
@@ -91,6 +90,77 @@ class VersionTest(TestCase):
 
         self.assertEqual(response.status_code, 200, path)
 
+    def test_get_remaining_platforms(self):
+        version_platforms_none = create_version(metadata__platforms=None)
+        self.assertEqual(version_platforms_none.get_remaining_platforms(), set())
+
+        version_platforms_empty = create_version(metadata__platforms=[])
+        self.assertEqual(version_platforms_empty.get_remaining_platforms(), set())
+
+        version_platforms_some = create_version(metadata__platforms=['linux-x64', 'windows-x64'])
+        self.assertTrue(version_platforms_some.get_remaining_platforms())
+
+        version_two_files = create_version(metadata__platforms=['linux-x64'])
+        file = FileFactory(metadata__platforms=['windows-x64'])
+        version_two_files.files.add(file)
+        self.assertTrue(version_two_files.get_remaining_platforms())
+
+        version_platforms_all = create_version(
+            metadata__platforms=[p.slug for p in Platform.objects.all()]
+        )
+        self.assertEqual(version_platforms_all.get_remaining_platforms(), set())
+
+        skip_platforms = set(['linux-x64', 'windows-x64'])
+        version_platforms_without_some = create_version(
+            metadata__platforms=[
+                p.slug for p in Platform.objects.all() if p.slug not in skip_platforms
+            ]
+        )
+        self.assertEqual(version_platforms_without_some.get_remaining_platforms(), skip_platforms)
+
+    def test_collect_platforms_across_files(self):
+        version = create_version(metadata__platforms=['linux-x64'])
+        file = FileFactory(metadata__platforms=['windows-x64'])
+        version.add_file(file)
+        self.assertQuerysetEqual(
+            version.platforms.order_by('slug'),
+            Platform.objects.filter(slug__in=['linux-x64', 'windows-x64']).order_by('slug'),
+        )
+        file.delete()
+        version.refresh_from_db()
+        self.assertQuerysetEqual(
+            version.platforms.order_by('slug'),
+            Platform.objects.filter(slug__in=['linux-x64']).order_by('slug'),
+        )
+
+    def test_add_file(self):
+        version = create_version(metadata__platforms=['linux-x64'])
+        file = FileFactory(metadata__platforms=['linux-x64'])
+        with self.assertRaises(ValueError):
+            version.add_file(file)
+
+        all_platforms_version = create_version(metadata__platforms=[])
+        file = FileFactory(metadata__platforms=['linux-x64'])
+        with self.assertRaises(ValueError):
+            all_platforms_version.add_file(file)
+
+    def test_get_file_for_platform(self):
+        version = create_version(metadata__platforms=['linux-x64'])
+        file = FileFactory(metadata__platforms=['windows-x64'])
+        version.add_file(file)
+        self.assertIsNotNone(version.get_file_for_platform(None))
+        self.assertIsNotNone(version.get_file_for_platform('linux-x64'))
+        self.assertIsNotNone(version.get_file_for_platform('windows-x64'))
+        self.assertIsNone(version.get_file_for_platform('windows-arm64'))
+
+        file2 = FileFactory(metadata__platforms=['macos-x64', 'macos-arm64'])
+        version.add_file(file2)
+        self.assertIsNotNone(version.get_file_for_platform('macos-x64'))
+
+        version2 = create_version(metadata__platforms=[])
+        self.assertIsNotNone(version2.get_file_for_platform(None))
+        self.assertIsNotNone(version2.get_file_for_platform('macos-x64'))
+
 
 class UpdateMetadataTest(TestCase):
     fixtures = ['dev', 'licenses']
diff --git a/extensions/tests/test_submit.py b/extensions/tests/test_submit.py
index 687726bd..b3b8cbb4 100644
--- a/extensions/tests/test_submit.py
+++ b/extensions/tests/test_submit.py
@@ -80,7 +80,7 @@ EXPECTED_EXTENSION_DATA = {
         'version_str': '0.1.0',
         'slug': 'some-addon',
     },
-    'addon-with-split-platforms.zip': {
+    'addon-with-split-platforms-linux.zip': {
         'metadata': {
             'tagline': 'Some add-on tag line',
             'name': 'Some Add-on',
@@ -118,12 +118,14 @@ EXPECTED_VALIDATION_ERRORS = {
         'source': ['The manifest file is missing.'],
     },
     'invalid-manifest-toml.zip': {'source': ['Manifest file contains invalid code.']},
-    'invalid-theme-multiple-xmls.zip': {'source': ['Themes can only contain <strong>one XML file</strong>.']},
-    'invalid-theme-multiple-xmls-macosx.zip': {'source': ['Archive contains forbidden files or directories: __MACOSX/']},
+    'invalid-theme-multiple-xmls.zip': {
+        'source': ['Themes can only contain <strong>one XML file</strong>.']
+    },
+    'invalid-theme-multiple-xmls-macosx.zip': {
+        'source': ['Archive contains forbidden files or directories: __MACOSX/']
+    },
     'invalid-missing-wheels.zip': {
-        'source': [
-            'Python wheel missing: addon/wheels/test-wheel-whatever.whl'
-        ]
+        'source': ['Python wheel missing: addon/wheels/test-wheel-whatever.whl']
     },
 }
 POST_DATA = {
@@ -435,11 +437,11 @@ class SubmitFinaliseTest(CheckFilePropertiesMixin, TestCase):
         self.assertEqual(version.release_notes, data['release_notes'])
         # Check version file properties
         self._test_file_properties(
-            version.file,
+            version.files.first(),
             content_type='application/zip',
             get_status_display='Awaiting Review',
             get_type_display='Add-on',
-            hash=version.file.original_hash,
+            hash=version.files.first().original_hash,
             original_hash='sha256:2831385',
         )
         # We cannot check for the ManyToMany yet (tags, licences, permissions)
@@ -515,7 +517,7 @@ class NewVersionTest(TestCase):
         self.assertTrue(response['Location'].startswith('/oauth/login'))
 
     def test_validation_errors_agreed_with_terms_required(self):
-        self.client.force_login(self.version.file.user)
+        self.client.force_login(self.version.files.first().user)
 
         with open(TEST_FILES_DIR / 'amaranth-1.0.8.zip', 'rb') as fp:
             response = self.client.post(self.url, {'source': fp})
@@ -527,7 +529,7 @@ class NewVersionTest(TestCase):
         )
 
     def test_validation_errors_invalid_extension(self):
-        self.client.force_login(self.version.file.user)
+        self.client.force_login(self.version.files.first().user)
 
         with open(TEST_FILES_DIR / 'empty.txt', 'rb') as fp:
             response = self.client.post(self.url, {'source': fp, 'agreed_with_terms': True})
@@ -539,7 +541,7 @@ class NewVersionTest(TestCase):
         )
 
     def test_validation_errors_empty_file(self):
-        self.client.force_login(self.version.file.user)
+        self.client.force_login(self.version.files.first().user)
 
         with open(TEST_FILES_DIR / 'empty.zip', 'rb') as fp:
             response = self.client.post(self.url, {'source': fp, 'agreed_with_terms': True})
@@ -551,7 +553,7 @@ class NewVersionTest(TestCase):
         )
 
     def test_upload_new_file_and_finalise_new_version(self):
-        self.client.force_login(self.version.file.user)
+        self.client.force_login(self.version.files.first().user)
         self.extension.approve()
 
         # Check step 1: upload a new file
@@ -570,7 +572,7 @@ class NewVersionTest(TestCase):
         self.assertEqual(new_version.version, '1.0.8')
         self.assertEqual(new_version.blender_version_min, '4.2.0')
         self.assertEqual(new_version.schema_version, '1.0.0')
-        self.assertEqual(new_version.file.get_status_display(), 'Approved')
+        self.assertEqual(new_version.files.first().get_status_display(), 'Approved')
         self.assertEqual(new_version.release_notes, '')
         self.assertEqual(
             ApprovalActivity.objects.filter(
@@ -595,6 +597,60 @@ class NewVersionTest(TestCase):
         self.assertEqual(new_version.release_notes, 'new version')
 
 
+class MultiPlatformUploadTest(TestCase):
+    def test_upload_more_files(self):
+        extension = create_version(
+            metadata__id="some_addon",
+            metadata__version="0.0.1",
+        ).extension
+        file_linux = TEST_FILES_DIR / 'addon-with-split-platforms-linux.zip'
+        file_windows = TEST_FILES_DIR / 'addon-with-split-platforms-windows.zip'
+        file_no_platforms = TEST_FILES_DIR / 'addon-without-platforms-for-split-test.zip'
+        self.client.force_login(extension.authors.all()[0])
+
+        with open(file_linux, 'rb') as fp:
+            response = self.client.post(
+                extension.get_new_version_url(),
+                {'source': fp, 'agreed_with_terms': True},
+            )
+        self.assertEqual(response.status_code, 302)
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.files.count(), 1)
+        self.assertEqual(extension.latest_version.platforms.count(), 1)
+
+        with open(file_windows, 'rb') as fp:
+            response = self.client.post(
+                extension.get_new_version_url(),
+                {'source': fp, 'agreed_with_terms': True},
+            )
+        self.assertEqual(response.status_code, 302)
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.files.count(), 2)
+        self.assertEqual(extension.latest_version.platforms.count(), 2)
+
+        # can't upload the same file a second time
+        with open(file_windows, 'rb') as fp:
+            response = self.client.post(
+                extension.get_new_version_url(),
+                {'source': fp, 'agreed_with_terms': True},
+            )
+        self.assertEqual(response.status_code, 200)
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.files.count(), 2)
+        self.assertEqual(extension.latest_version.platforms.count(), 2)
+
+        # can't upload a platform-agnostic file
+        with open(file_no_platforms, 'rb') as fp:
+            response = self.client.post(
+                extension.get_new_version_url(),
+                {'source': fp, 'agreed_with_terms': True},
+            )
+        self.assertEqual(response.status_code, 200)
+        extension.refresh_from_db()
+        self.assertEqual(extension.latest_version.files.count(), 2)
+        self.assertEqual(extension.latest_version.platforms.count(), 2)
+
+
 class DraftsWarningTest(TestCase):
     fixtures = ['licenses']
 
diff --git a/extensions/tests/test_views.py b/extensions/tests/test_views.py
index 9c531034..2a560b8b 100644
--- a/extensions/tests/test_views.py
+++ b/extensions/tests/test_views.py
@@ -216,7 +216,7 @@ class ExtensionManageViewTest(_BaseTestCase):
 class UpdateVersionViewTest(_BaseTestCase):
     def test_update_view_access(self):
         extension = _create_extension()
-        extension_owner = extension.latest_version.file.user
+        extension_owner = extension.latest_version.files.first().user
         extension.authors.add(extension_owner)
 
         random_user = UserFactory()
@@ -246,7 +246,7 @@ class UpdateVersionViewTest(_BaseTestCase):
 
     def test_blender_max_version(self):
         extension = _create_extension()
-        extension_owner = extension.latest_version.file.user
+        extension_owner = extension.latest_version.files.first().user
         extension.authors.add(extension_owner)
         self.client.force_login(extension_owner)
         url = reverse(
diff --git a/extensions/urls.py b/extensions/urls.py
index a2c63b8e..576a3dd5 100644
--- a/extensions/urls.py
+++ b/extensions/urls.py
@@ -17,7 +17,7 @@ urlpatterns = [
     # API
     path('api/v1/extensions/', api.ExtensionsAPIView.as_view(), name='api'),
     path(
-        'api/v1/extensions/<str:extension_id>/versions/new/',
+        'api/v1/extensions/<str:extension_id>/versions/upload/',
         api.UploadExtensionVersionView.as_view(),
         name='upload-extension-version',
     ),
@@ -28,6 +28,7 @@ urlpatterns = [
     path('search/', public.SearchView.as_view(), name='search'),
     path('tag/<slug:tag_slug>/', public.SearchView.as_view(), name='by-tag'),
     path('team/<slug:team_slug>/', public.SearchView.as_view(), name='by-team'),
+    path('download/<filehash>/<filename>', public.file_download, name='download'),
     re_path(
         rf'^(?P<type_slug>{EXTENSION_SLUGS_PATH})/',
         include(
diff --git a/extensions/views/api.py b/extensions/views/api.py
index 1d18f21b..7e254d05 100644
--- a/extensions/views/api.py
+++ b/extensions/views/api.py
@@ -12,7 +12,6 @@ from django.db import transaction
 from common.compare import is_in_version_range, version
 from extensions.models import Extension, Platform
 from extensions.utils import clean_json_dictionary_from_optional_fields
-from extensions.views.manage import NewVersionView
 from files.forms import FileFormSkipAgreed
 
 
@@ -55,17 +54,16 @@ class ListedExtensionsSerializer(serializers.ModelSerializer):
             except Platform.DoesNotExist:
                 self.platform = self.UNKNOWN_PLATFORM
 
-    def to_representation(self, instance):
-        matching_version = None
+    def find_matching_files_and_version(self, instance):
         # avoid triggering additional db queries, reuse the prefetched queryset
-        versions = [
-            v
-            for v in instance.versions.all()
-            if v.file and v.file.status in instance.valid_file_statuses
-        ]
+        versions = sorted(
+            [v for v in instance.versions.all() if v.is_listed],
+            key=lambda v: v.date_created,
+            reverse=True,
+        )
         if not versions:
-            return None
-        versions = sorted(versions, key=lambda v: v.date_created, reverse=True)
+            return ([], None)
+
         for v in versions:
             if self.blender_version and not is_in_version_range(
                 self.blender_version,
@@ -73,42 +71,48 @@ class ListedExtensionsSerializer(serializers.ModelSerializer):
                 v.blender_version_max,
             ):
                 continue
-            platform_slugs = set(p.slug for p in v.platforms.all())
-            # empty platforms field matches any platform filter
-            # UNKNOWN_PLATFORM matches only empty platforms field
-            if self.platform and (platform_slugs and self.platform not in platform_slugs):
-                continue
-            matching_version = v
-            break
+            if self.platform:
+                if file := v.get_file_for_platform(self.platform):
+                    return ([file], v)
+            else:
+                return (v.files.all(), v)
 
-        if not matching_version:
-            return None
+        return ([], None)
 
-        data = {
-            'id': instance.extension_id,
-            'schema_version': matching_version.schema_version,
-            'name': instance.name,
-            'version': matching_version.version,
-            'tagline': matching_version.tagline,
-            'archive_hash': matching_version.file.original_hash,
-            'archive_size': matching_version.file.size_bytes,
-            'archive_url': self.request.build_absolute_uri(
-                matching_version.download_url(append_repository_and_compatibility=False)
-            ),
-            'type': EXTENSION_TYPE_SLUGS_SINGULAR.get(instance.type),
-            'blender_version_min': matching_version.blender_version_min,
-            'blender_version_max': matching_version.blender_version_max,
-            'website': self.request.build_absolute_uri(instance.get_absolute_url()),
-            # avoid triggering additional db queries, reuse the prefetched queryset
-            'maintainer': instance.team and instance.team.name or str(instance.authors.all()[0]),
-            'license': [license_iter.slug for license_iter in matching_version.licenses.all()],
-            'permissions': matching_version.file.metadata.get('permissions'),
-            'platforms': [platform.slug for platform in matching_version.platforms.all()],
-            # TODO: handle copyright
-            'tags': [str(tag) for tag in matching_version.tags.all()],
-        }
-
-        return clean_json_dictionary_from_optional_fields(data)
+    def to_representation(self, instance):
+        matching_files, matching_version = self.find_matching_files_and_version(instance)
+        result = []
+        for file in matching_files:
+            data = {
+                'id': instance.extension_id,
+                'schema_version': matching_version.schema_version,
+                'name': instance.name,
+                'version': matching_version.version,
+                'tagline': matching_version.tagline,
+                'archive_hash': file.original_hash,
+                'archive_size': file.size_bytes,
+                'archive_url': self.request.build_absolute_uri(
+                    matching_version.get_download_url(
+                        file,
+                        append_repository_and_compatibility=False,
+                    )
+                ),
+                'type': EXTENSION_TYPE_SLUGS_SINGULAR.get(instance.type),
+                'blender_version_min': matching_version.blender_version_min,
+                'blender_version_max': matching_version.blender_version_max,
+                'website': self.request.build_absolute_uri(instance.get_absolute_url()),
+                # avoid triggering additional db queries, reuse the prefetched queryset
+                'maintainer': (
+                    instance.team and instance.team.name or str(instance.authors.all()[0])
+                ),
+                'license': [license_iter.slug for license_iter in matching_version.licenses.all()],
+                'permissions': file.metadata.get('permissions'),
+                'platforms': file.get_platforms(),
+                # TODO: handle copyright
+                'tags': [str(tag) for tag in matching_version.tags.all()],
+            }
+            result.append(clean_json_dictionary_from_optional_fields(data))
+        return result
 
 
 class ExtensionsAPIView(APIView):
@@ -153,7 +157,10 @@ class ExtensionsAPIView(APIView):
             request=request,
             many=True,
         )
-        data = [e for e in serializer.data if e is not None]
+        data = []
+        for entry in serializer.data:
+            data.extend(entry)
+
         return Response(
             {
                 'blocklist': Extension.objects.blocklisted.values_list('extension_id', flat=True),
@@ -201,14 +208,16 @@ class UploadExtensionVersionView(APIView):
                 status=status.HTTP_403_FORBIDDEN,
             )
 
-        # Create a NewVersionView instance to handle file creation
-        new_version_view = NewVersionView(request=request, extension=extension)
-
-        # Pass the version_file to the form
-        form = new_version_view.get_form(FileFormSkipAgreed)
+        form = FileFormSkipAgreed(
+            data={},
+            extension=extension,
+            request=request,
+        )
         form.fields['source'].initial = version_file
 
         if not form.is_valid():
+            if 'source' in form.errors:
+                form.errors['version_file'] = form.errors.pop('source')
             return Response({'message': form.errors}, status=status.HTTP_400_BAD_REQUEST)
 
         with transaction.atomic():
@@ -217,10 +226,16 @@ class UploadExtensionVersionView(APIView):
             file_instance.user = user
             file_instance.save()
 
-            version = extension.create_version_from_file(
-                file=file_instance,
-                release_notes=release_notes,
-            )
+            manifest_version = file_instance.metadata['version']
+            if version := extension.versions.filter(version=manifest_version).first():
+                version.add_file(file_instance)
+                version.release_notes = release_notes
+                version.save(update_fields={'release_notes'})
+            else:
+                version = extension.create_version_from_file(
+                    file=file_instance,
+                    release_notes=release_notes,
+                )
 
         return Response(
             {
diff --git a/extensions/views/manage.py b/extensions/views/manage.py
index 6b62031f..21980358 100644
--- a/extensions/views/manage.py
+++ b/extensions/views/manage.py
@@ -30,17 +30,9 @@ class VersionsView(ExtensionQuerysetMixin, ListView):
     paginate_by = 15
 
     def get_queryset(self):
-        """Allow logged in users to view unlisted versions in certain conditions.
-
-        * maintainers should be able to preview their yet unlisted versions;
-        * staff should be able to preview yet unlisted versions;
-        """
         self.extension_queryset = self.get_extension_queryset()
         self.extension = get_object_or_404(self.extension_queryset, slug=self.kwargs['slug'])
-        queryset = self.extension.versions
-        if self.request.user.is_staff or self.extension.has_maintainer(self.request.user):
-            return queryset.all()
-        return queryset.listed
+        return self.extension.versions.prefetch_related('files', 'platforms', 'permissions')
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
@@ -222,7 +214,11 @@ class NewVersionView(
     @transaction.atomic
     def form_valid(self, form):
         response = super().form_valid(form)
-        self.extension.create_version_from_file(self.object)
+        manifest_version = self.object.metadata['version']
+        if version := self.extension.versions.filter(version=manifest_version).first():
+            version.add_file(self.object)
+        else:
+            version = self.extension.create_version_from_file(self.object)
         return response
 
     def get_success_url(self):
diff --git a/extensions/views/public.py b/extensions/views/public.py
index ef92cdba..2209d24d 100644
--- a/extensions/views/public.py
+++ b/extensions/views/public.py
@@ -8,16 +8,15 @@ from django.shortcuts import get_object_or_404, redirect
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import DetailView, ListView
 
-from extensions.models import Extension, Version, Tag
 from constants.base import (
     EXTENSION_TYPE_SLUGS,
     EXTENSION_TYPE_PLURAL,
     EXTENSION_TYPE_CHOICES,
 )
-from stats.models import ExtensionView
+from extensions.models import Extension, Version, Tag
+from files.models import File
+from stats.models import ExtensionDownload, ExtensionView, VersionDownload
 import ratings.models
-
-from stats.models import ExtensionDownload, VersionDownload
 import teams.models
 
 User = get_user_model()
@@ -52,16 +51,32 @@ class HomeView(ListedExtensionsView):
 
 
 def extension_version_download(request, type_slug, slug, version, filename):
+    """A backward-compatible url for downloads.
+
+    Assuming only a single file for a given version.
+    """
+    extension_version = get_object_or_404(Version, extension__slug=slug, version=version)
+    file = extension_version.files.first()
+    return file_download(request, file.hash, filename)
+
+
+def file_download(request, filehash, filename):
     """Download an extension version and count downloads.
 
+    This method processes urls constructed by Version.get_download_list.
+
     The `filename` parameter is used to pass a file name ending with `.zip`.
     This is a convention Blender uses to initiate an extension installation on an HTML anchor
     drag&drop.
+    Also see $arg_filename usage in playbooks/templates/nginx/http.conf
     """
-    extension_version = get_object_or_404(Version, extension__slug=slug, version=version)
+    # TODO check file status
+    file = get_object_or_404(File, hash=filehash, version__isnull=False)
+    extension_version = file.version.first()
     ExtensionDownload.create_from_request(request, object_id=extension_version.extension_id)
     VersionDownload.create_from_request(request, object_id=extension_version.pk)
-    return redirect(extension_version.downloadable_signed_url + f'?filename={filename}')
+    url = file.source.url
+    return redirect(f'{url}?filename={filename}')
 
 
 class SearchView(ListedExtensionsView):
@@ -227,6 +242,9 @@ class ExtensionDetailView(DetailView):
     queryset = Extension.objects.listed.prefetch_related(
         'authors',
         'latest_version__files',
+        'latest_version__files__validation',
+        'latest_version__permissions',
+        'latest_version__platforms',
         'latest_version__tags',
         'preview_set',
         'preview_set__file',
@@ -235,11 +253,6 @@ class ExtensionDetailView(DetailView):
         'ratings__ratingreply__user',
         'ratings__user',
         'team',
-        'versions',
-        'versions__files',
-        'versions__files__validation',
-        'versions__permissions',
-        'versions__platforms',
     ).distinct()
     context_object_name = 'extension'
     template_name = 'extensions/detail.html'
diff --git a/files/forms.py b/files/forms.py
index f8e2e254..44464771 100644
--- a/files/forms.py
+++ b/files/forms.py
@@ -10,6 +10,7 @@ from django.utils.translation import gettext_lazy as _
 from .validators import (
     ExtensionIDManifestValidator,
     ExtensionNameManifestValidator,
+    ExtensionVersionManifestValidator,
     FileMIMETypeValidator,
     ManifestValidator,
 )
@@ -36,11 +37,15 @@ class FileForm(forms.ModelForm):
         # TODO: surface TOML parsing errors?
         'invalid_manifest_toml': _('Manifest file contains invalid code.'),
         'invalid_missing_init': mark_safe(_('Add-on file missing: <strong>__init__.py</strong>.')),
-        'missing_or_multiple_theme_xml': mark_safe(_('Themes can only contain <strong>one XML file</strong>.')),
+        'missing_or_multiple_theme_xml': mark_safe(
+            _('Themes can only contain <strong>one XML file</strong>.')
+        ),
         'invalid_zip_archive': msg_only_zip_files,
         'missing_manifest_toml': _('The manifest file is missing.'),
-        'missing_wheel': _('Python wheel missing: %(path)s'), # TODO <strong>%(path)s</strong>
-        'forbidden_filepaths': _('Archive contains forbidden files or directories: %(paths)s'), #TODO <strong>%(paths)s</strong>
+        'missing_wheel': _('Python wheel missing: %(path)s'),  # TODO <strong>%(path)s</strong>
+        'forbidden_filepaths': _(
+            'Archive contains forbidden files or directories: %(paths)s'
+        ),  # TODO <strong>%(paths)s</strong>
     }
 
     class Meta:
@@ -69,8 +74,8 @@ class FileForm(forms.ModelForm):
     )
 
     def __init__(self, *args, **kwargs):
-        self.request = kwargs.pop('request')
         self.extension = kwargs.pop('extension', None)
+        self.request = kwargs.pop('request')
         for field in self.base_fields:
             if field not in {'source', 'agreed_with_terms'}:
                 self.base_fields[field].required = False
@@ -160,6 +165,10 @@ class FileForm(forms.ModelForm):
                 ManifestValidator(manifest)
                 ExtensionIDManifestValidator(manifest, self.extension)
                 ExtensionNameManifestValidator(manifest, self.extension)
+                ExtensionVersionManifestValidator(
+                    manifest,
+                    self.extension,
+                )
 
                 self.cleaned_data['metadata'] = manifest
                 self.cleaned_data['type'] = EXTENSION_SLUG_TYPES[manifest['type']]
diff --git a/files/models.py b/files/models.py
index 2c6f47c1..048b9be1 100644
--- a/files/models.py
+++ b/files/models.py
@@ -177,15 +177,20 @@ class File(CreatedModifiedMixin, TrackChangesMixin, models.Model):
             'website': data.get('website'),
         }
 
-    @property
-    def parsed_version_fields(self) -> Dict[str, Any]:
-        """Return Version-related data that was parsed from file's content."""
-        # Currently, the content of the manifest file is the only
-        # kind of file metadata that is supported.
-        data = self.metadata
+    def get_platforms(self):
+        return self.parse_platforms_from_manifest(self.metadata)
+
+    @classmethod
+    def parse_platforms_from_manifest(self, data):
         build_generated_platforms = None
         if 'build' in data and 'generated' in data['build']:
             build_generated_platforms = data['build']['generated'].get('platforms')
+        return build_generated_platforms or data.get('platforms')
+
+    @property
+    def parsed_version_fields(self) -> Dict[str, Any]:
+        """Return Version-related data that was parsed from file's content."""
+        data = self.metadata
         return {
             'version': data.get('version'),
             'tagline': data.get('tagline'),
@@ -193,7 +198,7 @@ class File(CreatedModifiedMixin, TrackChangesMixin, models.Model):
             'schema_version': data.get('schema_version'),
             'licenses': data.get('license'),
             'permissions': data.get('permissions'),
-            'platforms': build_generated_platforms or data.get('platforms'),
+            'platforms': self.get_platforms(),
             'tags': data.get('tags'),
         }
 
diff --git a/files/validators.py b/files/validators.py
index f040e882..944d29b9 100644
--- a/files/validators.py
+++ b/files/validators.py
@@ -16,6 +16,7 @@ from extensions.models import (
 )
 from constants.base import EXTENSION_TYPE_SLUGS_SINGULAR, EXTENSION_TYPE_CHOICES
 from files.utils import guess_mimetype_from_ext, guess_mimetype_from_content
+import files.models
 
 logger = logging.getLogger(__name__)
 
@@ -164,6 +165,52 @@ class ExtensionNameManifestValidator:
                 )
 
 
+class ExtensionVersionManifestValidator:
+    """Validates version existence in db and available platforms."""
+
+    def __init__(self, manifest, extension_to_be_updated):
+
+        # If the extension wasn't created yet, any version is valid
+        if not extension_to_be_updated:
+            return
+
+        manifest_version = manifest.get('version')
+        version = extension_to_be_updated.versions.filter(version=manifest_version).first()
+        if not version:
+            return
+        # for existing versions only submissions for remaining platfroms are valid
+        remaining_platforms = version.get_remaining_platforms()
+        if platforms := files.models.File.parse_platforms_from_manifest(manifest):
+            if diff := set(platforms) - remaining_platforms:
+                raise ValidationError(
+                    {
+                        'source': [f'{version} already has files for {", ".join(diff)}'],
+                    },
+                    code='invalid',
+                )
+        else:
+            if remaining_platforms:
+                raise ValidationError(
+                    {
+                        'source': [
+                            f'File upload for {version} is allowed only for remaining platforms: '
+                            f'{", ".join(remaining_platforms)}'
+                        ],
+                    },
+                    code='invalid',
+                )
+            else:
+                raise ValidationError(
+                    {
+                        'source': [
+                            f'The version {escape(manifest_version)} was already uploaded for this '
+                            f'extension ({extension_to_be_updated.name})'
+                        ],
+                    },
+                    code='invalid',
+                )
+
+
 class ManifestFieldValidator:
     @classmethod
     def validate(cls, *, name: str, value: object, manifest: dict) -> str:
@@ -511,30 +558,6 @@ class SchemaVersionValidator(VersionValidator):
             )
 
 
-class VersionVersionValidator(VersionValidator):
-    example = '1.0.0'
-
-    @classmethod
-    def validate(cls, *, name: str, value: str, manifest: dict) -> str:
-        """Return error message if cannot validate, otherwise returns nothing"""
-        if err_message := super().validate(name=name, value=value, manifest=manifest):
-            return err_message
-
-        extension = Extension.objects.filter(extension_id=manifest.get("id")).first()
-
-        # If the extension wasn't created yet, any version is valid
-        if not extension:
-            return
-
-        version = extension.versions.filter(version=value).first()
-
-        if version:
-            return mark_safe(
-                f'The version {value} was already uploaded for this extension '
-                f'({extension.name})'
-            )
-
-
 class VersionMinValidator(VersionValidator):
     example = '4.2.0'
 
@@ -639,7 +662,7 @@ class ManifestValidator:
         'schema_version': SchemaVersionValidator,
         'tagline': TaglineValidator,
         'type': TypeValidator,
-        'version': VersionVersionValidator,
+        'version': VersionValidator,
     }
     optional_fields = {
         'blender_version_max': VersionMaxValidator,
diff --git a/ratings/templates/ratings/rating_list.html b/ratings/templates/ratings/rating_list.html
index b2e70db7..67d3922e 100644
--- a/ratings/templates/ratings/rating_list.html
+++ b/ratings/templates/ratings/rating_list.html
@@ -4,7 +4,7 @@
 {% block page_title %}{{ extension.name }}{% endblock page_title %}
 
 {% block content %}
-  {% with latest=extension.latest_version author=extension.latest_version.file.user %}
+  {% with latest=extension.latest_version %}
     <div class="d-flex mt-4">
       <h2>
         {% with text_ratings_count=extension.text_ratings_count %}
diff --git a/reviewers/templates/reviewers/extensions_review_detail.html b/reviewers/templates/reviewers/extensions_review_detail.html
index bd6257ef..f62ccc04 100644
--- a/reviewers/templates/reviewers/extensions_review_detail.html
+++ b/reviewers/templates/reviewers/extensions_review_detail.html
@@ -180,12 +180,16 @@
       <strong>Try at your own risk.</strong>
     </p>
     <div class="btn-col">
-      <a href="{{ extension.latest_version.download_url }}" download="{{ extension.latest_version.download_name }}" class="btn btn-danger btn-block">
+      {% with build_list=extension.latest_version.get_build_list %}
+      {% for build in build_list %}
+      <a href="{{ build.url }}" download="{{ build.name }}" class="btn btn-danger btn-block">
         <i class="i-download"></i>
         <span>
-          {% trans 'Download' %} v{{ extension.latest_version.version }}
+          {% trans 'Download' %} v{{ extension.latest_version.version }} {{ build.platforms|join:", " }}
         </span>
       </a>
+      {% endfor %}
+      {% endwith %}
     </div>
   </div>
   {% endif %}
diff --git a/reviewers/tests/test_views.py b/reviewers/tests/test_views.py
index 1fb91fca..d2028a1d 100644
--- a/reviewers/tests/test_views.py
+++ b/reviewers/tests/test_views.py
@@ -14,7 +14,7 @@ class CommentsViewTest(TestCase):
         self.default_version = version
         ApprovalActivity(
             type=ApprovalActivity.ActivityType.COMMENT,
-            user=version.file.user,
+            user=version.files.first().user,
             extension=version.extension,
             message='test comment',
         ).save()
diff --git a/reviewers/views.py b/reviewers/views.py
index f9ad2ef7..4e6569e6 100644
--- a/reviewers/views.py
+++ b/reviewers/views.py
@@ -77,9 +77,13 @@ class ExtensionsApprovalDetailView(DetailView):
     def get_queryset(self):
         return self.model.objects.prefetch_related(
             'authors',
+            'latest_version__files',
+            'latest_version__files__validation',
+            'latest_version__permissions',
+            'latest_version__platforms',
+            'latest_version__tags',
             'preview_set',
             'preview_set__file',
-            'versions',
         ).all()
 
     def get_context_data(self, **kwargs):
diff --git a/users/tests/test_tasks.py b/users/tests/test_tasks.py
index 12567b39..59028ff5 100644
--- a/users/tests/test_tasks.py
+++ b/users/tests/test_tasks.py
@@ -10,7 +10,6 @@ from common.tests.factories.extensions import RatingFactory, create_approved_ver
 from common.tests.factories.reviewers import ApprovalActivityFactory
 from common.tests.factories.users import OAuthUserFactory, create_moderator, UserFactory
 import extensions.models
-import files.models
 import users.tasks as tasks
 
 User = get_user_model()
@@ -83,11 +82,11 @@ class TestTasks(TestCase):
         self.assertEqual(response.status_code, 200)
         response = self.client.get(version.extension.get_versions_url())
         self.assertEqual(response.status_code, 200)
-        response = self.client.get(version.download_url())
+        response = self.client.get(version.get_download_url(version.files.first()))
         self.assertEqual(response.status_code, 302)
         self.assertEqual(
             response['Location'],
-            f'/media/{version.file.original_name}'
+            f'/media/{version.files.first().original_name}'
             f'?filename=add-on-{version.extension.slug}-v{version.version}.zip',
         )
         # Check that ratings remained publicly accessible
@@ -146,10 +145,9 @@ class TestTasks(TestCase):
             user.refresh_from_db()
 
         # Check that unlisted extension file and version were deleted
-        with self.assertRaises(files.models.File.DoesNotExist):
-            self.authored_unlisted_extension.latest_version.file.refresh_from_db()
         with self.assertRaises(extensions.models.Version.DoesNotExist):
             self.authored_unlisted_extension.latest_version.refresh_from_db()
+        self.assertFalse(self.authored_unlisted_extension.latest_version.files.all())
 
         # Check that reports made by this account remained accessible
         self.report1.refresh_from_db()