The stable version is stored on
pypy.python.org, and can be installed with the pip3 system
command. Most systems will already have python installed, but it may be
necessary to install pip3 also. Do that with
sudo easy_install pip3
in a unix shell. This must only be done once; after that, the pip3 command will be available for installing any python package on pypi.
Now that the OS is set up, it's time to install nota itself. This is done with
sudo pip3 install nota
or, if you are upgrading to a new version, use
sudo pip3 install nota --upgrade