Thank you for your download. 

To launch the application, you need to mark the executable with execute permission. This is simply due to how strict Apple is with 3rd-party software.

1. Access your Terminal.
2. Navigate to the downloaded folder:

cd <PATH_TO_YOUR_APP>/<APP_NAME>.app/Contents/MacOS/

3. Add the correct permissions to launch the app:

chmod -R 777 TreasureIsland.app

4. You should now be able to launch the game!

