Hi Steve and welcome to the forum!
When you install the software from the CD, the title bar at the very top left of the screen should read "AirNav RadarBox 3D - 4.03"
If it does, that's fine and once you have registsred the software with AirNav, you'll be able to see the 3D stuff.
If the title bar reads anything else, you will need to download the 3D version from the link.
If you've been monitoring the forum, you will probably be aware that if you are usimg Windows 7 or Vista, you should NOT accept the default installation directory for the software, which will be in C:\Program Files - you should install to a directory called something like C:\AirNav Systems.
If you have problems installing the software or getting the 3D to work, you will be best contacting Support directly - they're very helpful.
Hope that helps
Rod