Both the Triton plugin and standalone exe work on Windows 7. As I'm sure you know, we'll be hearing all about how Windows 7 is falling out of support in the coming few weeks (except for Microsoft's Corporate cronies, of course, where updates will continue.. ).
So expect to see Windows 10 as the requirement going forward, whether or not that's actually a "real" requirement, as companies have to err on the side of caution since, if something breaks (not that Microsoft would ever deliberately do anything like that.. ) then, without the possibility of updates to fix it, it's possible they can't do anything about it.