We will write a small introductory in the Wiki soon, to get the 'greater' picture on what is required and how this process works.
The GeoConvert tool, like we have said before, is not just plug and play. Creating aerial images for use with Aerofly FS 2 is a fairly complex step, this is necessary however to have a smooth operation while flying.
So be patient, we will try to write a better introduction soon.