Your database was touched by YouTrack build 12634. Downgrade is denied, please restore your database from backup.

I have an install of YT that was corrupted a few weeks ago. In this it was installed again from the installer on the site.

I have a license that expired last year for upgrades, so I'm looking to downgrade to the build from then. However I get this error message.

I performed a backup of the database and tried replacing the database in the teamsysdata folder with this, but I still get the error.

Am I missing something?