merged from trunk 20741:20848

* Missing changes to release/windows/installer
* Sequencer fixes in source/blender/src/seqaudio.c dont apply to 2.5
* brechts fix for #18855 r20763 wasnt merged, does this apply to 2.5?

source/creator/creator.c

@@ -868,7 +868,7 @@ static void error_cb(char *err)
 
 static void mem_error_cb(char *errorStr)
 {
-	fprintf(stderr, "%s", errorStr);
+	fputs(errorStr, stderr);
 	fflush(stderr);
 }