It depends on which license key you have. You either bought "Terragen 2" or "Terragen 2 with Animation". Both use the same software installer (Terragen 2 Deep Edition) but the animation features are either enabled or disabled depending on what license key it uses. If you bought one of the Xfrog bundles, you should have Terragen 2 with Animation.
One way you can quickly tell whether you have the animation key is to go to the Project menu and look for "Bake Animation Curves..." It's not a feature you'll probably use, but it's only available if you have an animation license.
John has left Planetside, so make sure you use the support@ address. If you did buy Terragen 2 with Animation but have the wrong key, we'll issue you with a new one.
Matt
