I still got a Win7 box. I would be afraid of the process hanging mid-upgrade, creating me a brick.
Don’t trust Gates one iota.
Just extract your windows 7 key:
https://www.passcope.com/reviews/how-to-find-windows-7-product-key-using-cmd/
If the upgrade fails reinstall windows 7 with the media if you have it, or you can download it from one of these:
https://archive.org/details/win-7-pro-32-64-iso
https://www.microsoft.com/en-us/software-download/windows7
You know Bill Gates hasn’t had anything to do with Microsoft in over a decade, right?