PaulS:
Those instructions are WRONG. User-downloaded libraries do not go in the core library folder.User-downloaded libraries go in the libraries folder in the sketchbook folder.
O M G, was having serious issues getting an example sketch to compile. First it was that it couldn't find a header file. Then once I copied the header file path and used that I got "undefined" compile errors.
Figured what the heck and pull the whole folder and place it in my sketch book libraries folder and it WORKED.
So simple and so stupid. WHY won't all of these work from within the regular libraries folder???