Not a Unity problem. I've been given this information that makes it work, but I need to fix it on my side and re-release the Mac version. You can give it a try in the mean time if you wish: The file in the /Contents/MacOs/ directory needs to be changed into a unix executable file.
Actually version mac can run but need to use terminal to open
First : extract file then drag to desktop (after make this run you can drag it back somewhere in folder)
Second : Open terminal then type cd Desktop then enter
Third : Copy and paste this
chmod +x TheStorageAccident_MacOS_V1.1.app/Contents/MacOS/'The Storage Accident'
then enter and from now it should work