Running GOG version. Base game and CC worked. Expanding Fronts worked. After reboot (?) or something game can't launch. The hung EXE process cannot be killed even by elevated command line, "Unkillable process killer" tools, and it even makes the log-out or shut down hang. Further reboots results in the same. EXE starts, does nothing, can't be killed.
Tried the steam community all-in-one fix.
https://steamcommunity.com/sharedfiles/filedetails/?id=636984276
Same results.
No video and the usual method of avoiding the intro vids when launching doesn't change this. Directplay fix doesn't fix it regardless.
Tried various mixes of running as admin, compatibility modes, etc.
Running Windows 10, no version (base, or expansions) will launch.