$ mkdir -p ~/.vim/pack/codecomm/opt
    $ cd ~/.vim/pack/codecomm/opt
    $ git clone git://git.stargrave.org/codecomm.git
    $ vim -u NONE -c "helptags codecomm/doc" -c quit

You can also use https://git.stargrave.org/codecomm.git Git URL.

This example installs codecomm as an optionally loaded plugin, so you
have to ":packadd codecomm" for enabling it. Use "start" instead of
"opt" directory to load it automatically.