Plugin won't load in Maya 2022

Hi all, just trying to get RRM3 up and running in my preferred Maya Version, 2022.4. I installed to the default location. The plugin doesn't show up in Plugin Manager, so I go to Browse ---> C:\ProgramData\Autodesk\ApplicationPlugins\rrm3\Contents\plug-ins\2022\rapidrig_modular_v3.py

When I load this, what appears in the Plugin Manager instead is __init__.py, and trying to load that generates the following error: // Error: file: C:/Program Files/Autodesk/Maya2022/scripts/others/pluginWin.mel line 316: (__init__) //

I can get the plugin to load normally following these same steps in Maya 2023.

Any help is appreciated.