Sorry about that! Could you send us a screenshot of what the file looks like after you download it? Hopefully we can help.
Thank you for that! It looks like that is what the file is supposed to be. If you put that directly into the "game" folder of the larger game directory, that will give you access to the DLC! It's a .rpa file, so it should work just fine. If you have any other trouble, though, let us know. And thanks for playing!
