Hello,
I am current running on Windows 10 Pro, upgraded from Windows 7 Pro Retail.
I am going to make a fresh install Win 10, but with which Product Key will I need to use to active (Windows 7)?
Or do I have to install Windows 7 first (and upgrade to Windows 10 again)?
Or, if I want to transfer my license to an another computer, do I need to install Windows 7 first?
Thank you so much
You simply install 10 Pro and skip key entry. In rare event, it does not activate, use 7 pro key to activate.
To transfer to new pc, you can clean install windows 10, and use 7 key to activate. However sometimes it will complain key is in use, so you would need to reinstall 7 (don't do all the updates), then telephone activate it, saying that is your only pc. Then you will be able to clean install 10 and use 7 key to activate. You are required to move OS from old drive of course.
A good trick is to install 7 on a spare hard drive, temporarily removing drive with 10 installed.
and grabbing the genuineticket.xml file for insurance:
Clean Install Windows 10 Directly without having to Upgrade First - Windows 10 Forums
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