The main purpose of this repo is to provide a tap for a formula for ytarchive. This is an updated version I've made because upstream isn't updating this.
brew install omerien/ytarchive/ytarchive
Or brew tap omerien/ytarchive and then brew install ytarchive.
If you want the dev version, run brew install omerien/ytarchive/ytarchive-dev
If you want to install with ffmpeg (necessary to mux the final file), add --with-ffmpeg. I recommand installing it separately since it has a lot of dependencies - here is the official download link for macOS.
brew help, man brew or check Homebrew's documentation.