Warning: this system is at best very much WIP. It is, as yet, a pointless idea to try to use it unless you're like literally the person I'm making this package for.
If you are person I'm making it for, however, here's my suggestion for how to install it: clone it with Git into the systems subdirectory of your Foundry data directory.
Then you can just git pull and restart or reload (F5) Foundry to pull in new changes as I work on it!