Hey! I can't really test it myself since I'm not on Mac, but the game folder in the ZIP file should looks like this:
RomComDivergence-0.1.4.2-mac.zip\RomComDivergence.app\Contents\Resources\autorun\game
Here's a bit of extra help courtesy of ChatGPT:
...And this should be where you need to drop the patch.rpa file (I suppose?)