A custom brew formulae which will not conflict with existing helm 2 installations. Useful for migrating versions while maintaining compatibility.
You may also want to pin existing helm 2 installations incase the official formulae is updated to helm 3.
brew pin kubernetes-helm
brew install gary-mansell/kubernetes-helm3/kubernetes-helm3
Or brew tap gary-mansell/kubernetes-helm3 and then brew install kubernetes-helm3.
Or install via URL (which will not receive updates):
brew install https://raw.githubusercontent.com/Gary-Mansell/homebrew-kubernetes-helm3/master/Formula/kubernetes-helm3.rb
helm3 version
brew help, man brew or check Homebrew's documentation.