On MacOS, the set up process has become significantly easier, but you will need to remove the application from quarantine.

Download the Deskthing app from the DeskThing webpage and copy the app to the Applications folder.

Once the app has been moved open the Terminal app and navigate to the Applications directory. Run the command sudo xattr -r -d com.apple.quarantine DeskThing.app and the application will launch normally.

Connect your CarThing to your Mac and your deivce should appear underneath the Clients tab