This versions of GiD works on Mac OS X 10.7 Lion or 10.8 Mountain Lion , x64 operating system.
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.