I'll be "Blunt" with ya, there is a bit of a learning curve to go thru to Download and install the Aircraft files properly and Scenery too.
Not quite as simple as Point & Click and ready to go .
Listen to Bill Womack and his advice here !
tho this is NOT how you Download & inject Aircraft into FSX ,its totally Different way.
also didn't say where you live at

???
it may seem difficult to you at 1st , as it did with me for a long time

, but once you see how easy it really is and a few tricks & tips , you'll be able to install & inject any Aircraft and scenery into Flight Simulator .
Really once I got the hang of it, I was surprised and then I went on some kind of Aircraft & Scenery Download Binge for 2 years, and now , I have over - 4,775 Aircraft in my FSX Gold / Acceleration simulator, and about 350 add on Sceneries too.
Its a little frustrating at 1st and it will be, but don't get pissed of at yourself and quit, or give up , ask questions and tell what your doing and how, the more specifics you provide the more some of the Older Veteran Sim Pilots can guide ya thru it !
in the meantime watch & re-watch this Video Tutorial by Bill Womack on installing Scenery into FSX.
[youtube]http://www.youtube.com/watch?v=C8kO1IsJMuE[/youtube]