brew cask specific version
# Go to https://github.com/Homebrew/homebrew-cask/find/master
# Type in the application name
# Click on the *.rb file of the application you need
# Click “History”
# Find the version you need by reading the commit messages and view the raw file. Confirm the version variable (normally on line 2) is the version you need.
# Download the raw file. Example :
wget https://raw.githubusercontent.com/Homebrew/homebrew-cask/003355667efbdbf86cd6eb2e9b27a06f92b3e832/Casks/google-chrome.rb
brew install --HEAD -s google-chrome.rb