And... that deserves another “bump”!
I am now beginning to see systems in need of work that already have Win10 installed, and unfortunately there does not seem to be an easily-utilized ( :) ) method to “downgrade” the machines to Win 7xx or even *cough* to Win 8xx.
This is not a “good” thing...
M$FT offers a 30 day “roll back” for Win 7 machines that get upgraded to Win 10. Most of time this is an alternative although I have heard of machines that failed the roll back.
If the machine was running Win 7 it still has a valid Win 7 license. If you do a clean install, that license can be used. Of course this erases the user’s data and applications. Hopefully you can backup the data. Applications will probably have to be reinstalled, another headache.