brew cask install bob-swinkels/dji-assistant/<cask>
Or brew tap bob-swinkels/dji-assistant and then brew cask install <cask>.
Or install via URL (which will not receive updates):
brew cask install https://raw.githubusercontent.com/bob-swinkels/homebrew-DJI-assistant/master/Casks/<cask>.rb
There are different casks to choose from (all from dji.com/downloads):
dji-assistant2- (view on DJI site)dji-assistant2-mavic- (view on DJI site)dji-assistant2-phantom- (view on DJI site)dji-assistant2-matrice- (view on DJI site)dji-assistant2-mg- (view on DJI site)dji-assistant2-battery-station- (view on DJI site)dji-assistant2-autopilot- (view on DJI site)
brew help, man brew or check Homebrew's documentation.