This is a versioned cask repo of the anka-virtualization packages, so you can use specific versions.
Originally part of https://github.com/bitrise-io/homebrew-cask
brew install bitrise-io/anka-cask/<formula>
Or brew tap bitrise-io/anka-cask
and then brew install <formula>
.
brew help
, man brew
or check Homebrew's documentation.