OK, know it sounds too good to be true but I have scored a 3DR Solo from a private seller for $250.00 with hard case, 2 extra batteries, gimble with Go-Pro Hero 4 and chargers for all, seems he is moving to Alaska and selling stuff, anyway, looking at the Solex app and was wondering if I need to have the original Solo app first on my device before downloading the Solex app or can I just download the Solex app and go flying? Apologies for the long thread but still learning on this drone.