Every time I try and open Tux and Fanny for Mac I get an error message saying I do not have permission? any help?

I am updating my computer to the latest version.

- https://itch.io/t/1744030/doesnt-run-on-my-apple-mini the steps on this thread made it work. 

Except it didnt tell me my password was correct or anything. after completing the steps I opened finder and right clicked the app and clicked 'open' instead of opening it from my dock.