In between
request #5808 and
request #6338, changing a file from one package
to another or changing it's release date, make the file disappear.
The file is still present on the filesystem but the information in the DB is incorrect hence the file is not downloadable and you get an "File not found" error.
You can be affected if:
- You ran 6.9 or 6.10 release
- You are using FRS
- You changed files from one release to another
- Or you changed releases from one package to another
- Or you changed File or Release dates