itch.io

oh. lol.

Simple answer: you can either double-lick the new-home.zip file, or right-click the file and select "open."

More in-depth answer: 

Okay, so first, make sure you've downloaded the DLC after purchasing it (if you haven't downloaded the DLC yet, you should be able to download it in the same manner you downloaded the game originally). 

Then, you need to find the DLC file on your computer. 

• If you downloaded it through a web-browser (like Google Chrome, or Safari), it'll probably be in your "Downloads" folder (open up "Finder" application, and the "Downloads" folder should be listed on the left side). The zipped filename should be "new-home.zip". Double click that file, and it'll create a folder named "post-game" in the same folder as the zip file.
• If you downloaded it through the itch desktop application, then it was unzipped automatically when you downloaded it. To find it, you should right-click the DLC in your itch library, and then click "Show in Finder". That'll bring you to a folder named "crosscode-a-new-home". Open that folder, and you should see a folder named "post-game". 

The "post-game" folder is the unzipped DLC folder I mentioned in my previous post, follow the instructions I listed there, and you should be good.

After downloading and unzipping the DLC, right-click the CrossCode Application, and click "Show Package Contents." Then, go to Contents -> Resources -> app.nw -> assets -> extension. Then, drag the unzipped DLC folder into this location. Then, launch the game. On the Main Menu, if you check the installed DLC list, it should now include "Post-Game" (or something along those lines).

(Very Minor Spoilers Below)
To actually begin the DLC, (Assuming that you've already beaten the game, gotten the "Good Ending" and are currently at the point just after the post-credits scenes are complete), walk to the right. If you didn't get the "Good Ending," walk left, and either figure out how to get it, or google it shouldn't take more than 10-15 minutes, tops, to get the "Good Ending," once you figure out what to do.