Whenever I try and open the download to play it says that it cannot be opened (this is for Mac btw)
hmmm, I haven't heard of any other issues... (I don't have a mac to test it with)... anyone else have issues?
you have to make sure that you allowed the use of applications from appstore and others in your system preference (security).
Also, you have to right click on the app to open it the first time, you will be asked confirmation to open this app. It may not actually open the first time but since the autorization have been given, you should be able to open the app by double clicking.
I hope i was clear enough. Good luck