2.4. Installing Wireshark under macOS
From Wireshark 2.1
The official macOS packages are distributed as disk images (.dmg) containing the application installer. To install Wireshark simply open the disk image and run the enclosed installer.
The installer package includes Wireshark, its related command line utilities, and a launch daemon that adjusts capture permissions at system startup. See the included Read me first file for more details.