As a test, run the lunar-far-side-test-demo.pov program found in the LUNEX home folder, just to make sure everything is working so far. The LUNEX program should quickly render the far (hidden) side of the moon in fast render mode 1, as shown below, if all is OK.
The only difference between the lunar far-side settings and the default full moon settings is the selenographic longitude of the camera (eye) at the center of the view. We simply move the camera to the opposite side of the moon (0 longitude + 180 degrees) and view it from there.
The default longitude setting of: #declare CamLon = +000.0; // -W/E+
will render the standard full moon.
Simply changing that setting to: #declare CamLon = +180.0; // -W/E+
will render the far (hidden) side of the moon at full phase.
LUNEX rendering of the Far (hidden) Side of the Moon