Game Crashes when Custom/Local Files are enabled as of 1.33

[Eros]

Does anyone have any way how to fix this. I've been trying to edit the built-in campaigns for my own pleasure (like modifying models and sound files) when 1.32 was still around (using a repacked version of the game), got frustrated with how I can't open the 1.33 campaigns to the 1.32 game, and was forced to buy the game for good. Now that I have the game properly, I can't even modify it! I'm starting to regret all the money and time I spent on this