I got locked in one of those update loops.  You know what I mean, probably.  My Windows 10 would start an automatic update, then fail, and then reset itself to a previous version.  This would happen all of the time.

I managed to use one of the methods on this link to successfully do an update:

https://www.alphr.com/microsoft/1001411/how-to-fix-windows-update-in-windows-10-if-it-becomes-stuck-1

Now, here is the reason why I am making this post.  In case I want to ever do a completely fresh reinstall of Windows 10, I want to know how to do this because the CD (DVD, maybe?) and all I have is the ("OEM"?) sticker with the associated ID numbers.

Just use the Media Creation Tool provided by Microsoft here to either create a DVD or USB flash drive with the installation files. Then all you need to do is boot from the device of your choosing and follow the instructions provided here.

As I type this, I am creating the UBS drive thanks to your link.

I will let you know how it goes.

Thanks.