The internet is littered with fake "cracked" versions of Rig-gns. Many contain ransomware, keyloggers, or crypto miners. Do not download from random file-sharing forums.
Rig-gns is a modular rigging framework designed to automate the creation of animation-ready skeletal structures. It bridges the gap between raw 3D meshes and expressive character animation by generating robust Inverse Kinematics (IK) and Forward Kinematics (FK) systems.
: Rapid setup for cloth and hair simulations to add secondary motion.
If you specifically need version (perhaps for compatibility with an older version of Blender):