Apple recently added another step to publishing non-appstore games for MacOS that retroactively broke previously working versions of games. I'll take down the broken version for now, and I'll try to get a working version back online.
And if you're getting the "No game found" error on any of the downloads for Mac, you have to move the file into a different folder. If it's in your downloads folder, move it to desktop. If it's in desktop, put in in applications, etc. Just anywhere besides where it is