It was an open beta program, Pappy;  anyone who wanted to could run the beta Win10, on as many machines as you wanted - the more different machines, the better..  MicroSoft wanted to gather compatibility info on as many different system configurations as they could get.  If you see the black & white Windows icon in your notification tray (bottom right of your monitor, I've boxed it in green here), that indicates that someone has beta tested a machine matching your hardware configuration and it has been found to be compatible.

     I don't know of any problems with Poser Pro 2014 and Win10 per se;  the only problems I've heard of were due to lack of drivers for some particular piece of hardware (maybe a USB3 host PCIe card for older machines, for example), but these drivers have been getting coded and released prodigiously.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5