Fix
If the game crashes after an update, it's most likely due to config and savegame changes made to the new versions.
Try to delete this folder -> C:\Users\[UserName]\AppData\Local\UnitedAssault
Open this this folder -> C:\Users\[UserName]\AppData\Local\UnitedAssault, replace [UserName] with your Windows User name
Backup the file Savegames/Progression.sav in the folder mentioned above
Now delete the entire folder C:\Users\[UserName]\AppData\Local\UnitedAssault
Try to start the game.
You can now restore your progress my adding the previously backed up Progression.sav by copying it to it's original folder.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=2470433367