I’m getting “itch.io api error (400)” stating I have to buy the game.
Are you able to share a screenshot of this error so I can understand what you’re seeing? I’m not aware of an API error like that which would force you to buy the game. But, if the game is shown in your library then it will show the default buy game UI.
To get ANYTHING to work, every single game in the bundle still has to be manually added into my account
That’s correct, we have not changed how the bundle works. You still have to go through your purchase receipt page to access the games.
that it’s installed, and even when it can catch those I can’t launch anything through the app
Games you manually download and install are not detected by the app. If you want someone to appear in the app you must install it through the app. Hope that makes sense