Short version:
I have Windows 8.1 Enterprise Edition installed and need to activate it, but I only have a legal consumer-version license key. Can I "downgrade" the installed OS to the proper version so that I can Activate?
Background:
I have a legal license for Windows 8 64bit "Full Version" (that's what the NewEgg receipt from 2012 says). The SSD I had that OS installed on has apparently died and I haven't been able to boot into or perform any repair on the drive, so I've performed a fresh install on a spare HDD. However, the installer I downloaded onto a USB drive from Microsoft wouldn't work, so I borrowed an install DVD from a friend, which installed perfectly fine. However, now I have installed copy of Windows 8.1 Enterprise Edition, and a consumer product key, so I can't Activate Windows.