The "RH" efforts were often associated with the LPak Community Project , which provided non-English translations for the interface, making the VTT accessible to global players.
Are you trying to install a from an older library, or Extensions | Fantasy Grounds Quick fantasy grounds ii v2012 extras rh install
Much of the extra content is user-created and available through the Fantasy Grounds Forge. Installation Process for Extras The "RH" efforts were often associated with the