I have a Win 7 Asus laptop, and a couple of years ago I had it repaired. The shop put on Win 7 Ultimate, in place of my own "genuine" version. Not a single problem.........until
......I tried to upgrade to Win 10, which it decided to not do and then since I have been nagged that my Windows is not "genuine."
I guess my solutions include leave it alone, or pay to get a "genuine" copy of some version.
I have another touch laptop which had Win 8.1 and the Win 10 upgrade worked out fine.