Thanks a lot for your interest! I'm so sorry that you ran into problems.
One of the users recommended to change some lines in the executable. As i'm not a Mac user myself I don't know exactly if that's a good idea..
There is this other approach that seems easier:
1 In the Finder, locate the app (in the Applications folder, most likely)
2 Press the Control-key and click the app icon
3 Choose Open from the contextual menu
(copy and pased from https://superuser.com/questions/898124/the-application-someapp-app-can-t-be-open...)
If you still can not play it, please, ask for a refund! Thanks again!