okay you need to check to make sure it installed correctly into your aircraft folder ie by the installer should point to where you installed FS ie on mine assuminf you using fs9
C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\
if you look in there and you cant see the aircraft then it is been put some where else so you will need to find where it went and move it to the correct folder.
better done through the install system
hope that helps