I was upgrading from9.0 to 9.1 and it failed. It gave an error message about
the SQL agent, and when I restarted the services did not start and I think
the device and media service is the root of it. I tried to reapply the drivers,
using the "BackupExecTapeDeviceDriverInstall_261717" file, but that said
it was for 9.0 only. Is there a current version to run on 9.1?

Or will it be easier just to revert back to 9.0? If so, what is the process
of doing this?