When you order the earth sculptor through RL you get the plugin.
Then you can go to earth sculptor site and update.
RL may have included the update by now... 1.1 I think it is.
The earth sculptor is pretty easy to use, but it isn't well documented.
Maybe I should say, you the docs are there. Yet, you don't really know how things come out in earth sculptor.
Also, when the ES files are exported as vns or obj the terrain may not look like what you were working with in Earth Sculptor.
If I can get a better idea on using Bryce and can import into iClone with 3DX5 that may be the best course of action. Placing textures in Earth Sculptor is a mixed bag of how to do things
I bought the biosphere design content thing to get the earth sculptor a major disappointment the ES.
Still... it's what we have to work with, if we want our own custom terrains.