Got an email with the download link, clicked on it, and it downloaded. Not being a smartass..........that's what I did.
Had to spend a little time figuring out how to use it after I unzipped it...........no instructions. There are 6 tiles with different levels of resolution...........you pick the level of quality and go from there. Run each tile thru Poseray and texture with the appropriate map and save. When you load in Terragen, the tiles line up where they are supposed to go...........don't have to fiddle with placement other than altitude. The origin is somewhere in the atmosphere..........I just left it there.