You're probably looking for DJI Assistant 2. It lets you install firmware updates on your Phantom 4 Pro and your remote controller. Here's how to install it:
1. Download DJI Assistant 2 from here (scroll down until you see the Software section): https://www.dji.com/phantom-4/info

2. Once you've downloaded the Assistant, open Finder, then go to your downloads folder. Right-click (or hold the Control key while clicking) on the installer package, then click Open. You'll be prompted if you want to continue. Click Open.
3. Progress through the installer until you are prompted to install DJI Assistant 2 onto your MacBook. Click Install, then provide your administrator username and password.
4. Decide whether or not you need HoRNDIS. If you have an Android phone (not iPhone) and you would like to be able to use your Android phone's hotspot, you may want to consider installing HoRNDIS. Otherwise, at the top of the screen, click on Installer, then click Quit.
5. Open Finder, then go to your Applications folder. Open Assistant. If you are prompted to allow Assistant to accept incoming network connections, click Allow.
6. Power on your remote controller and your Phantom 4 Pro. Then, connect the remote controller to your MacBook. If all goes well, your remote controller should appear on your MacBook Pro.
Hope this helps!