Hello I'm on W8 pro, got the ISO of 8.1 pro, used the pro key, and when it asks me what I want to preserve, I only get the options of "personal files" and "nothing". I want to upgrade and not have to install al over again. I've tried editing the cversion.ini, even tried erasing it, and it won't change anything. Any clue of what I can do? Thanks a lot!