tidal-bootstrap is small python script which attempts to ease the installation process of the TidalCycles programming environment on macOS.
1) If you don't have homebrew you first need to install it. Follow the instructions on the homebrew page.
If you are not sure if you have homebrew or not, open up a Terminal (Spotlight -> Terminal) and type:
which brew if nothing happens you don't have homebrew and need to install it.
2) Download the zip file from this page and extract it somewhere (like your desktop)
3) Open the folder and double-click on the file
tidal-bootstrap.command, a Terminal window will pop up and you will get further instructions.
4) Go make some music with TidalCycles :)