The Mac Pharos ("Popup") client ships with its own uninstaller. Uninstalling the software is recommended if you leave MIT, or before installing a new version of the software.
To uninstall it, navigate to /Library/Application Support/Pharos/Utilities in the Finder, and double-click on the icon labeled Uninstaller. Once the Uninstaller launches, select Popup in the list of programs to uninstall. You will be prompted for your administrative password in order to completely uninstall the software.