brew install educelab/casks/<formula>
Or brew tap educelab/casks and then brew install <formula>.
brew help, man brew or check Homebrew's documentation.
cd "$(brew --repository)"/Library/Taps/educelab/homebrew-casks
brew bump-cask-pr --no-fork educelab/casks/volume-cartographer --version VERSION_NUM # add --no-audit if a pre-release package