This version of GiD works on macOS 10.9 Mavericks and newer. Other versions for older Mac OS X operating systems are available here.
Note for macOS 10.15 Catalina: The first time you open GiD, macOS will display a message about opening an application from an unidentified developer. Just dismiss this window and Control+Click the application and select open. Now the window will show an ‘Open’ button to launch GiD.
Developer versions of GiD are more modern versions of the program that have new capabilities. They have not passed the validation tests that a official version does. So, use them with care. Only download and install one of these versions if you know of a new capability very important for your needs or if you want to try the new improvements in the program.