I bought the FoCal Pro Version 188.8.131.52 software, and I'm trying to use the Parallels software, which is a virtual Windows application for the Mac that allows Windows 8 (and also 7 if you have a CD,) to work on the Mac. Focal supplies Window 8 free. I will start today to see if I can use FoCal Pro with the D800 camera. And will report here how it went. So far, I can get the Parallel's Desktop, where FoCal would run, but what I don't like is that it takes command go my mouse, and to get back to the Mac, I have to Force Quit Parallels. However, it should not hamper the testing with FoCal. We shall see. If Parallels works with FoCal, I'll buy it, about $80.