How to upgrade to windows 10 correctly?

Question

Windows

Good evening!
Actually the essence of the issue:
There is a laptop on it with Win10 Pro installed, updated with win8.1. On Win8.1 there was a license key, got from the university for personal use.
Win7 Home basic was on the same laptop, and since the free update will end soon, I would like to update Win7 home basic to the latest version, you never know)))
If I take win10 pro from the laptop now, I install win7home basic and update it to 10 log in the same account as on the pro version, and then return everything back.
That is, I will return to win10 pro (the win8.1 pro key, which I got from the university). All this will be performed on one laptop, respectively, on one hardware, i.e. two different keys and one MS account.
Is it possible to do so? Whether everything will be all right with licenses?
UPD: Is it still possible to upgrade from home to pro?

Answer 1

from the version of home to pro it will not be possible to upgrade without buying an update for 7 home to pro, and then from 7 to 10 you can get an update to pro