Open the terminal (launchpad-other-terminal), copy the command starting with sudo to the terminal (copy the command to ""sudobash-c "curl-s/best/officethinner/master/officethinner.sh | bash" "here), and enter your own Mac password (usually your boot password). Of course, after every update of Office20 16 on Mac, the occupied size of Office20 16 will be restored, so if you want to slim down Office20 16 after every update, you need to run this terminal command once.