Having struggled recently (and succeeded) to install an old Epson SCSI scanner into 2K, I know how frustrating it can be.
Try the drivers from this site -
Then if you can find your scanner in Device Manager you can select 'update drivers'.
Clearly the people you spoke to either don't konw or don't care with the ridiculous advice to leave it switched on!
It might have to be switched on before booting for a session, but that is different from leaving it on all the time.