Download Kosmorro on macOS

macOS currently does not include Python 3 (only Python 2 is provided). The best and simplest method to install it is with HomeBrew. Follow the installation instructions to get it, then install the python package from it. Once it is done, use PIP3 to install Kosmorro:

brew install python
pip3 install --user kosmorro

Note: if you get a "command not found" error when you try to run the kosmorro command, check that the $HOME/.local/bin is in your $PATH. This folder is a standard place to install applications locally, so this may be useful for many other apps.

If you want to generate a PDF file, you might want to look at its dedicated documentation too.

You might also want to read the manpage to know how to use Kosmorro's command line program.