I have a working bootcamp on my Mac Pro 5,1. Recently upgraded Windows to Win 10 anniversary. Use option on boot which sometimes takes 2 attempts to boot correctly. As part of my trouble shooting found that if I try to use Bootcamp Assistant I get the following message: This page https://support.apple.com/en-au/HT204990 indicates only Mac Pro able to run Win 10 is the 2013 model. However win 10 runs fine on my 5,1.