Does Windows 8 Pro activated, work? After I change with working Windows 8 Product Key, key Worked on 8.1 after upfated to Windows 8.1 "genuine key"?
if I understand correctly op means if he can use a genuine 8 key for activating 8.1 if so, the answer is yes if 8.1 is installed with generic key first and then key is changed to original 8 key
Don't forget that little workaround where entering a legit 8 retail key allows you to download the 8.1 ISO