I have a Toshiba Satellite that was running 7 home premium. Through my school I got a copy 7 Pro X64 with (I thought) a valid product key.
During installation the setup will not accept the product key. Says the key is invalid. I can’t seem to simply cancel the install and revert back to home premium. I’ve tried everything I can think of, and it keeps trying to install pro, gets to the product key screen, lather rinse repeat.
So I have a bad key. Can at least revert back to my old OS?