I updated the file again and it now has only the Mac files in there.
If it still doesnt work then I found an option from a steam message board you can try:
https://steamcommunity.com/app/363890/discussions/1/3277925755444294890
It still doesn't work when downloaded! However, the Steam page suggestion worked like a charm and it opened up, no problem!
Excellent. I'll set that as the instructions to run it on Mac.
