I'm currently running the Windows 8 (32-bit; I "upgraded" from Vista to see if this works well on my hardware) Release Preview. I've bought a Pro license a while back and I decided to hold off on using it until I was truly satisfied with Windows 8.
However, the Preview's license key expired today.
I don't know if I can clean install Windows 8 Pro through an upgrade disc. Is there anyway for me to do so? I have a legitimate license key for Windows 8 Pro, but after that, I have no idea where to start.