I have had Reflex XTR for about 2yrs. now and love it. I have downloaded many aircraft and heli's and probably 8 different fields.
Here's how I do it; First I created a separate folder to place all of my downloads, ( It makes it easier for me to keep track of which ones I have used ) Then I copy whichever one I want to install in Reflex and go to : My computer - Local Disk- (hard drive) -Program files - Reflex - and then open up the folder labeled Flugzeug (for Aircraft)and then paste the copied file in that folder. Once that is done then I unzip or extract all, and thats it. If you are downloading Heli's then the sae thing but open up the heli folder. as for landing sites I do the same thing but just unzip and extract them in the main Reflex folder itself.
Now sometimes you wont get a picture of the aircraft in you directory when using the sim just a circle with a diagonal band, don't worry ! it's there. just click on it and when the screen tell you that it is not available then use the drop-down box and it will give you the list and then you can find it there and choose the sound also. It may not be the right way but it works for me. Hope this helps you .
gkclrk62