Alright. So. I bought the expansion a couple of weeks ago, been trying to register the codes ever since the purchase but keep getting invalid code. After looking around I noticed that my mog station doesn't even say it's the steam version of the game. Now, I bought the steam version a long time ago and have been using it for ages. I still have to code naturally so I've tried to register that too. Still get invalid code. Way before all this I did just have the regular windows version, which is probably what is messing up everything.

But for now, I'm out of ideas. Any help?