Win 10 Activation with Win 8.1 or Win 7 Key Share on Facebook Tweet on Twitter Share on LinkedIn Home › Forums › Client Operating Systems › Windows 10 › Win 10 Activation with Win 8.1 or Win 7 Key This topic contains 0 replies, has 1 voice, and was last updated by alexandros 1 week, 1 day ago. Viewing 1 post (of 1 total) Author Posts alexandrosParticipant September 11, 2019 at 4:48 pm #623605 Hi all, I have two company laptops that I have to format and upgrade to Windows 10 Pro. One laptop has a Windows 7 Pro retail key, and the other has Windows 8.1 Pro OEM key (BIOS). My question is the following: Is LEGAL to format and clean install Windows 10 Pro? Thanks in advance, Alex Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.