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.
GiD for Scientific Linux 7.x, RedHat 7.x or other Linux distributions with kernel 3.10 ( uname -r ) please check this page.
Check what is new in this release here.