Download the latest release as a '.zip' file and head over to Blender 4.20+. Go to Edit->Preferences->Add-on->Install and point to the downloaded '.zip' file. Drag and drop the downloaded '.zip' file ...
If it doesn't work check the addon folder in Appdata/Roaming/Blender Foundation/2.80/scripts/addons is called blender-rigui (latest release) Addon is very much WIP ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback