need help downloading my add on file onto FSX

Once it has finished downloading make sure you extract your files and also click on the aircraft name sometimes it's inside another folder inside of the one saying the same thing then you go to my computer go to the thing called C: then program files or program files(x86) if you have that then go to Microsoft games, Flight Simulator X, Sim Objects, and paste it in the Airplanes folder

You can also try checking the box "show all variations" where the aircraft shows up as your pick.