Error in assignID: quality with name 'mythic' does not exist. updated the pancake. I've ruined the whole game. how do I roll back to the previous version?

Source: legendary (quality).

I'm postponing the fix update for now.
I think it will let you download the previous version.

If you can't, manually download the old version from the Downloads tab. Then, in-game under Mods, if you have more than one version installed, a dropdown menu will appear where you can select which version of the mod you want to play.