The only thing you have to do is to extract it, into the main folder of your MS Flight Simulator X. For example into the location:
"C:\Program Files\Microsoft Games\Flight Simulator X\". If you want to fly it in the FS2004 it will have no problem. But in this case, remember to move the
"A-7E Corsair Hellenic Air Force" folder into the main FS2004 aircraft folder.
THIS IS THE QUESTION: Do i place the folder in the directory they gave me for FSX or do i got sim objects airplanes and place it in their for FSX? I am confused