Why not use the clients for Pc?

Yea I finally can start my script with a virtual enviroment and tkcalendar installed.

My switch from windows to linux is rough but I keep learning much new stuff.

Yes:

Note: Dependent package 'babel' contains 1 apps
  - pybabel

No apps associated with package tkcalendar. Try again with '--include-deps' to include apps of dependent packages, which are listed above. If you are attempting to install a library, pipx
should not be used. Consider using pip or a similar tool instead.

I installed pipx with “zypper install python311-pipx”.

But I can’t find a way to install the damn tkcalendar with it -> https://pypi.org/project/tkcalendar/#files

Feeling like an idiot here.

This really cant be that hard…

I think I wasnt clear there. I added the last two sentences when it finally worked on its own again and marked it as solved.