Armature Rigging Modules does not seem to be actively developed. The latest version of the addon will probably only work with the Blender 2.9x series.
Armature Rigging Modules
Armature Rigging Modules is a Blender add-on that provides a flexible system for rigging.
It allows you to build character rigs using modular components for arms, legs, hands, spine, and head, without needing to create custom rigging systems from scratch.
The add-on includes features like soft IK, automatic IK/FK switching, and other scripted mechanics designed to reduce the time spent on technical setup. It does not perform weight painting but is compatible with any armature that has already been skinned.