Importing ages is not the way to go if you want to learn about how complex texture stuff works. You would have to use an old version of pyprp and that would import with the old style of texturing. So, the information you got from any fine point of the texturing would be pretty wrong for the new version. Is the texturing that you want to know more about, a blender or pyprp thing? If it's a blender thing, there are tons of tutorials. If it's pyprp... well, if you only want to do texturing for most things; it's pretty simple and matches the blender documentation.
What are you trying to do/learn here?
EDIT: Ok, you're having trouble with the layers. Which layers? The ones in material panel? That age in the tutorial is pretty hard. Most of the stuff in that tutorial we didn't have a year ago. I'd suggest trying to do some stuff with UV unwrapping (find a good blender tutorial about that) and then try using that for your landscape texturing (at least until you get more comfortable with blender).
~Lontahv
Currently getting some ink on my hands over at the Guild Of Ink-Makers (PyPRP2).
