I presume that the reason you only see aircraft when the internet is on is because you are not picking up any aircraft and the ones you are seeing are network traffic and not picking up any from your receiver. If you pick up traffic they will show. on the MyFlights tab
On the network tab untick Get Flights from Radarbox Network,. Go onto the MyFlights tab and you will only show the aircraft you are picking up. Click on the aircraft and you will download photos for the aircraft if there are any on the server.
In Preferences/Radarbox/Photo and Aircraft Auto populate make sure you have ticked Download Aircraft Photo.
Lastly if you don't share Flight data, you will not get photo downloads
Alan