You can run the gdma_run_checks.pl script with the -v option to find out what version of the GDMA client software you have running on a given machine. Before GDMA 2.4.0, you cannot run this command as root, you must be logged in as some other user (such as gdma) to check the version.
Following is an example command and output for Linux GDMA.
The path to the gdma_run_checks.pl script depends on the platform. On Windows the name is: gdma_run_checks.exe