virtual instruments system requirements

Hello All-
 
I am noticing that the websites I am looking at with the intention of purchasing virtual instruments do not post the most basic of system requirements: Will the VI work with Windows 10?
 
I wanted to buy Chris Hein Horns compact, but was told by a vendor that it does not comply with Win 10 yet.
 
Can this be? Many of these make use of the Kontakt Player. If this works with Win 10, wouldn't the instrument?
 
I would like to use either "Chris Hein Horns Compact" or possibly Bigfishaudios "First Call Horns".  For basses, I am also looking at either Vir2 "BASiS" or possibly NI's "Scarbee Pre-Bass". None of them come right out and list the OS's except Vir2, which does it rather vaguely: "Windows XP SP2 or above."  I am pretty sure the "or above"  must refer to the version of Windows, NOT the service pack number, but I've been surprised before!
 
Any insights into Virtual Instruments compatibility with Windows 10 welcome!

AFAIK, any plugins that work on Windows 7 will work under W10. The only problems I've ever had were related to moving from a 32-bit environment to 64 bits, not to the O/S revision. Certainly any Kontakt-based instrument will be fine.