How do you add the DLC? I can't seem to figure it out (im looking at steam aswell and idk where the steam key activation things are 😭)
Here's how you activate it on Steam! https://help.steampowered.com/en/faqs/view/2A12-9D79-C3D7-F870
For the itchio version, you just drop the unzip the file and drop the .rpa file INTO the base game's game folder!