Can't install Add-on, Python files not working in Blender 4.1.1. on MacOS

[ErikDittert]

When trying to install the init.py, op_grow.py, panel.py and settings.py files, following error occurs:

Modules Installed () from '/Users/standard/Downloads/blender-differential-growth-2-1-1/init.py' into '/Users/standard/Library/Application Support/Blender/4.1/scripts/addons'

Do you know how to fix this? I updated Blender from 3.6.5 to 4.1.1 and that's when it stopped working - many people already stated that It's still working in 4.0 though.
Thanks, incredible work!