I've recently upgraded a Windows 8.1 Pro (OEM) to Windows 10 using the Media Creation tool since I was not getting the GWX icon. Activation has been successful from the OEM key. However, there were some registry issues from the Win 8.1 install itself, and these are still present despite the upgrade, and thus I would like to know whether if I format and clean install Windows 10 directly on the PC, will I be able to activate automatically again, or do I need to purchase a Win 10 key?
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