As an Ex Captain on corporate jets and prior to that a commercial pilot on piston twins and prior to that a PPL on singles do not take anything for granted!
PFLs or practised forced landings are supposed to stop at 500 feet AGL but from my...
You cannot count on manned aircraft to be at 500' AGL. See post #5.
Even with structures of known height nearby, it's extremely difficult for observers on the ground to accurately estimate the altitude of aircraft, even low flying aircraft. Your...
OP insists he can accurately estimate aircraft altitudes from the ground. Not believable.
OP says he knows someone who flies airplanes literally at treetop altitudes. Not believable.
OP doesn't say much about where exactly he is seeing all...
Folks are willing to help, but they need a clear description of the problem. "the program will not open" isn't very informative.
Were you downloading the DJI Assistant 2 on a computer? Phone? Were you able to download the file? Were you able to...