Yes, it seems Thurrott has some info: https://www.thurrott.com/windows/windows-10/3898/a-few-more-answers-about-windows-10-upgrades https://www.thurrott.com/win

Yes, it seems Thurrott has some info: https://www.thurrott.com/windows/windows-10/3898/a-few-more-answers-about-windows-10-upgrades https://www.thurrott.com/windows/windows-10/3898/a-few-more-... Basically it seems to be that MS saves the info in the Windows store and lets you reinstall a fresh Windows 10 if you upgraded. If this information is correct.