This finally opens - clueless as to why it wouldn't before. Gremlin invasion? Thanks!
The lesson assets download just fine and open just fine. I get the examples (coordinate pairs, etc.). But graph_plotting.pdf still opens to nothing more than a direction to download an older version of Adobe Reader than I am currently using and there are no other items in the file. I'm using OS 10.8.3 but the fact that I'm on a Mac shouldn't be an issue.
The .pdf that I downloaded only directs me to install Adobe Reader - there are no guides included as to how to create axes, etc. The sample project and media assets folder I downloaded shows examples, still no directions. Looks like a cool project but having directions would be nice!