P2 and P3 apps are completely different from the ground up, even stock DJI GO app for P3 and Vision app for P2.So they can charge you few times. When you sell your P2 and buy P3 you need to cash again for the new app and InApp options !
I say use original DJI Vision app since this one is too expensive.
Wanted to install this app on iPad mini 2. Have it on iPhone 6.
Bought Booster...no camera.
Bought camera...for p3, I have p2v plus.
My bad.