Baking Terrain Tree Shadows

Hello, after finding a script on the wiki that bakes tree shadows into the terrain lightmap, I can't figure out how to make it work. The script can be found here: LightmapWizard

Can anyone help me?

Oh, one other thing, I think it only works for Unity Pro users.

Thanks in Advance, CarbonTech Software Admin

Did you place the scipt in \Assets\Editor ?