Well those errors would likely be because the variables in the mod don't work if you don't start a new game - ie, if you play from a file that you made before you added the mod. Basically the updated files in my mod check for the new variables in the mod (like whether there's a couple together/if you're matchmaking any of them) but if you don't start a new file then those variables won't be present and it will send out an error.
So yeah if it's still not working with new files/if it's not acting like you have the full version with new files then this is very definitely not working 😅😅I know reinstalling a lot is annoying but honestly there's nothing else I can suggest - I purposely left out the file that makes the game the full version because it would have basically been stealing from the dev so I can't just go and add that in.
If I had to suggest something I'd recommend uninstalling the game as a whole, then reinstalling the mod, then the DLC, and see if that works.