NOTE TO EVERYONE WHO WAS HAVING TROUBLE UPDATING THE GAME ON THE LAUNCHER:
I've managed to revert to an older upload method that retains channels, so if you were still struggling then you shouldn't have any more issues and the game should update normally.
To everyone who uninstalled and re-installed the game to remove the error: you should be fine, and the game should update normally, but Itch's launcher was put together by Eldritch horrors bent on human suffering so I can't guarantee it. If you have trouble then uninstalling and reinstalling via the launcher again should work.
This is the last time you should all have these issues! The current upload system is stable so it should last all the way through to the end of CK's update cycle.
Sorry for the inconveniences, everyone!