I haven't purchased any keys for Win10 or Win11, was able to upgrade computers from Win7 and Win8/8.1 to Win10 when still possible. I even have 2 Notebooks I upgraded from 10 to 11 using the single-file change and they are activated. I did buy a new Win11 Notebook and later a new Win11 Desktop 2 years ago as what I had didn't meet the specs., both came with Win10 Pro and immediately got upgraded to Win11 after finishing setup. As for Win10, last month I upgrade a Win8.1 Notebook I was given to Win10, no issue yet.