Yep, running LR 5.7.1 on Windows 10 Pro 64-bit, since July 30th, with no problems whatsoever.
Lots of folks have done the Win10 upgrade. The results are mixed as you can see in this forum.
Some folks have no problems.
Some folks have multiple problems.
I have no intention of upgrading my Win7 computer to Win10. However, if I did, I would wait for at least one upgrade of LR before doing do.
If I was running win8 I might think otherwise.