An emergency quick patch was just uploaded. This was to fix some stuff that broke and made the game unplayable from this morning's patch.
The game should run perfectly for everyone now. And the File size should be smaller as well. The game should be under 1gb of used storage space now.
I apologise to everybody for the inconvenience of not being able to play the game for the duration of this morning.
Quick Patch
Source: Steam Community (opens in a new tab)