Most problems with updates to W10 involve well-used computers.
Have you tried an update after a clean install of W8.1?
I don't have an 8.1 system handy.
What happens when you run "slmgr /xpr" (without the quotes) from an elevated (Run as administrator) Command Prompt
I'm looking for a result that says something like Permanently Activated (this is a trick for W10, but I don't know if it applies to W8/8.1)
The point is that, if the system is permanently activated, you don't have to worry about activation on the same hardware in the future.
If that happens, then you can install 10 "clean" without worrying about activation.
Also, newer versions of 10 can be activated using your 7 or 8.1 product key (if you have it).
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