Since Windows licences are tied to the hardware you can reinstall it from almost any Windows installation media and it should automatically activate.
You need to add the EI.cfg and PID.cfg [0] files to the installer medium before booting it. Once you have those files present with the correct syntax, it will install the version you want, but I can't imagine a non-tech person being able to figure this out on his own.
[0] https://learn.microsoft.com/en-us/windows-hardware/manufactu...