Sorry for everyone that experienced issues with this game on release! I didn't configure the settings properly on Steamworks, which bizarrely lets the game work fine through my Steam client but no one else's.
Anyway, should be alright now, however, if the issue still persists you may need to restart Steam, or worst case scenario clear your download cache by going to Steam->Preferences->Dowloads->Clear download Cache.
Sorry again, I'm new here and still learning. I'll get better at this!