I believe it is Pro, but I'm not 100% on that and I'm at work now. When I first got the PC, which I bought because Axe Edit for XP was no longer supported, it worked fine. But then after an FM3 upgrade it started Reading Block Definitions every time I launched the program. I figured it was just that version of FM3 Edit, but no, the next one did the same thing. I don't even check now, I just change the shortcut every time the program is updated.
I ran Win 7 Pro or whatever for years at work and had zero problems. Recently I've upgraded PCs, so now I have Win 10 and a newer version of Office, and it seems like a downgrade to me. I have to reboot often because something will just stop working. And Outlook changes my view settings all by itself. I don't like it.