The script level for '%1!s!' in database '%2!s!' cannot be downgraded from %3!s! to %4!s!, which is supported by this server. ...

The script level for '%1!s!' in database '%2!s!' cannot be downgraded from %3!s! to %4!s!, which is supported by this server. This usually implies that a future database was attached  and the downgrade path is not supported by the current installation. Install a newer version of SQL Server and re-try opening the database.