I have downloaded this file several times and all I get is a patch of ground with no layering, this has been going on for a couple of years the file is broken and have yet been addressed to fix it.
Save your money and move on.
Sorry to hear you had trouble with this. You should open my layered PDFs using Abode Reader. The optional graphics layers are not visible when you first open the file. When viewing a layered PDF with Adobe Reader, on the left-hand side of the screen you should see the "layers" icon that looks like a couple of squares stacked on each other. If you click that icon, you'll open up the layers palette, and then you can begin choosing the optional graphics.
If you're not sure if you can use layered PDFs, try out my free model called the Coach House. It's a pretty good example of what you can expect from my layered PDFs, and it's free!
I just bought this item and its is just the same four ground tiles and nothing else. If it is to have layers to use there is no tool bar to do so. I have puchased other items as well form the same auther that have the same problem. I highly recomend that this item be taken down and not sold any longer until this problem is fixed.
Sorry about that! Layered PDFs aren't always intuitive to use. I recommend checking out any of my free models (Hovel, Coach House, Observatory, Free Cargo Pods) to see how my layered PDFs work.
To get full use of my layered PDFs, you'll need to use the free program Adobe Acrobat Reader.
When the layered PDF opens, locate the Layers Palette (might look like a "paper stack" icon). When you open the Layers Palette, you'll see the optional graphics layers available.
Hope that helps!