Could use a bit of help here. I have all the items downloaded from the marketplace yet when I click on any of the challenges it brings up the alert window to go to marketplace and download something - doesnt tell me what to download, (so i downloaded everything noted above) and it still wont work.
The landing challenge will show you what plane is required for each challenge. Did you check the Content Manager? It will show you all the files (aircraft, airports, challenges, etc) you can download.