[2019] I just bought and installed the game, but it will not start. I get a "MainWindow invocation error"

Sorry about this. We’re aware this error appears to have been a result of a recent launcher update, which we’ve since rolled back to hopefully mitigate the issue whist we look in to this. Please let me know if this is still an issue for you.

You shouldn’t have to do anything, the roll-back should be automatic. Perhaps restart your PC and verify integrity via Steam.