Download and run the client installer from here: https://privatevpn.com/client/PrivateVPN.dmg
Drag and drop PrivateVPN icon to Applications folder.
Open PrivateVPN app from the Applications folder.
Enter your password for the Mac account (not VPN password).
Click on Log In.
Enter your PrivateVPN registered email address and Password. Then click on Log In.
You may click Change to select a different VPN location.
Click the ON/OFF button to connect.