In early 2017, I recycled an Intel small-form-factor PC hardware that had previously been working full-time in the living room, running Windows Media Center on Windows 7 Ultimate. When I finally pulled the plug on Media Center after the release of Windows 10, I had put this little device on a shelf.
The GWX utility had never been installed on this PC and it had never been offered a Windows 10 upgrade via Windows Update.
As part of my digital clean-up, I decided to run the Windows 10 upgrade from Windows 7. I fully expected that after the upgrade was complete, the system would fail activation and I'd be asked for a product key.