oh! ok! so i downloaded from a safari browser last time, but this time i downloaded from chrome and got a ZIP file. i was able to open the ZIP file with the Archive Utility app.
sometimes a window pops up that says, "cannot be opened because the developer cannot be verified." but if that happens, i go into my System Preferences > Security & Privacy and hit the "Open Anyway" button. i'm able to access the game that way.
try deleting the previous version and let me know if that works though!