Interesting. It launches when I download and use that specific version of the launcher, too... I'll see if I can pull some older versions of CabinByTheLake.app and see if there's a particular one that starts failing.
An update here @nunu: the latest version works just fine! So... not sure what changed. I wonder if I had a corrupted save or something and booting the game via the renpy SDK fixed it or something.