I bought "Blood Oath" 5 years ago, so it's at least that old. Big Fish and Gamehouse don't seem to sell it anymore, so there may have been too many problems getting it working on current versions of Windows.
The
***July 12, 2014 web archive page*** for Blood Oath does list Windows 8, so you're right that it
used to work in Windows 8. But maybe some Windows update disabled it?
I assume you've tried adjusting compatibility mode for it -- disabling display scaling, running as Administrator, the usual troubleshooting.