unable to install on OSMC 2023.08-1

[bigjames122]

Sorry, I'm no real pro but I read many instructions.
Raspi3B + OSMC ist installed and works (ssh also)

Install
FOR KODI 19 OR ABOVE:
sudo apt-get update
sudo apt-get install build-essential python3-pip libnss3
sudo pip3 install setuptools wheel
sudo pip3 install pycryptodomex
no error

Then on the addon-browser the trial to add the zip allways ends up with a :( on the screen and osmc restarts the GUI.
I found no entry anywhere on the www - so I ask you for help
thanks