You need (as I recall) to flip the Master Power switch on the shift-4 panel. Otherwise, the gear doesn't work.
I got it to work fine in FSX Gold. To get the flaps and gear to work all you have to do is turn on the generator switches located on the right fore panel. It flies great and I would say slightly better than in FS9(not sure why, just seems so). The only thing I wish I could do is eliminate the rear view mirror reflections/movement. They look rather crappy in FSX and may even degrade the FPS a bit.
I created a folder to install the contents into and then dragged & dropped everything into place in FSX. No issues at all really. All the gauges seem to work and the plane handles fine.