I have purchased the Top Rudder  103 Solo from the MSFS Marketplace but have found that that the aerodynamics cannot be edited because the ENGINES and the FLIGHT_MODEL folders have been removed.

Is this common with Asobo products and does anyone know where the full product can be obtained?

 

 

 

All marketplace purchases are encrypted so you cannot modify them directly.
You can however override stuff by creating an entire new configuration file for the aircraft, but that's way more difficult than simply modifying an existing one.