Alright, I will ask around, if anyone else might have an idea what could possibly cause this.
If it's not too much of a hassle, would you mind, to redownload the game and try again maybe? or even on another computer, if you have access to another, and see if it's working.
Thank you! And sorry, it is hard to see the issue here. I redownloaded the file myself again, to check it, but it's working as intented.