My Mavic is finally on its way so I was preparing an older iPad to dedicate to the Mavic. I updated the software to version 9.3.5 and then tried to install the DJI Go 4 app. Every time I tried it would display a message stating that my device could not support the app. I then tried and was successful at down loading the DJI Go app. My questions are why can't I download the DJI Go 4 app and will I be all right just using the DJI Go app? Thanks