Hotfix for Launch issues after DLC release:
Troubleshooted some issues with the game not launching after the DLCs were implemented. Had to reload some files and correct some coding. Everything should be running smoothly now! If you still get an error, make sure to try verifying the files and uninstalling and reinstalling if the update doesn't go through.
Hotfix for DLC issues
Source: Steam Community (opens in a new tab)