I'd suggest, and this goes for all renpy games, and will save you headaches in the long run, that you download the renpy SDK. Once you do, you can put the game folders from WIN versions into the SDK folder, and it will run the games for you, even if you are playing on OSX. The renpy SDK comes with a .app renpy launcher, from which you can select a game folder for the SDK to run.All Mac links show corrupted when I try to unzip them, can someone reupload?
It probably sounds like a pain in the ass the way I described it, but it's just two steps. Place the folder (WIN/MAC/LINUX, doesn't matter, just as long as it's python, which all renpy games are) in the renpy SDK folder, then open up the renpy launcher. That's it. It opens up a handy dandy list of your games and you just select and launch the folder.