I have Windows 8.1 on my computer and I recently bought the Windows 8 Pro Upgrade disk from my university software store. They're both 64 bit. So here is the question, can I go from Windows 8.1 to Windows 8 Pro? I have inserted the upgrade disk but the computer does not do anything with it and it does not show up in the drive, also all that I got was the disk, no key or any information. I know once I have Windows 8 Pro on the computer I can get Windows 8.1 Pro for free.