I have just been promoted to Airline Transport Pilot

and because i have FSX i can only fly the boeing 747, so i downloaded it. I then checked and the Boeing 747 is in my simobjects folder but i can't select it on FSX because it is not on my aircraft list. I also have the same problems with my default 747, its in my simobjects folder and i have used it before but it has just disappeared, am i doing anything wrong? please help

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Thanks.