I just found out I had a key for this DLC that I got from a Fanatical (known as Bundle Stars back then) bundle years ago (around 2017).

This is not my type of game (then I don't own the game this DLC is for), it just was part of a bundle with other games I really wanted, and then I just forgot about it and left this key lying around (I don't even know if this site existed back then).

I can't be sure if it still works so whoever wins it please let me know, I hope they do.