Will Libreoffice work with Windows 10?
V5 will AFAIK.....I suspect that prior versions will as well.
I was running 4.4.4 when I upgraded one laptop to Win10/Pro. Worked fine. I did upgrade to 5.0.0.5 though so I could see the differences.
I upgraded a desktop [to Win10/Home] that I have attached to a 30 TV for media streaming. I do not use it often so it still had a 4.3.x version on it. It seemed to work OK, but I rarely would use LO on that setup.