You may want to try GOG's common troubleshooting tips before contacting support:
2) Download and install the latest updates for your Mac:
System Preferences -> Software Update -> Check Now.
3) Make sure that Accessibility options are enabled (the installer would have prompted you to do so, but please check it):
System Preferences -> Accessibility -> [check] Enable access for assistive devices.
4) Copy the game from the DMG file to the Applications folder again - in case it got corrupted. If that doesn't help, check if the game works when you launch it directly from the DMG file (just double-click instead of dragging the game to the Applications folder).
5) Finally, create a new user account, restart your Mac and log onto that new account. Now, try installing and playing the game. This will allow you to launch the game without most third-party applications that may have caused issues.
To create a new account, go to System Preferences - Users & Groups.
Also try starting the app as Superuser once:
Open the Applications folder, open the Terminal.app and type in:
sudo open Do not press Enter, but drag the game's app from the Applications folder to the terminal, this should add the correct path. Press Enter now and you should receive a prompt to enter your user's password.
