Hey there.
Have the game and the DLC since 2021, however when I tried to play it again today I can't select Max or any of the DLC characters, signaling me as not owning the Additional Content.

I checked the game's properties and the DLC's box is checked correctly... also tried verifying the integrity of the files and even reinstalled the game from scratch.

Can anyone please help?

I play it on keyboard, PC, Windows 10.