Where can I find a PDF of the User Guide?

You can press F1 for the help file.    It is also available online here:

Chanalyzer 3.0 User Guide - Explanation of the Chanalyzer 3.0 interface and features, including the new signature sidebar!

 

This should be very similar to the User Guide.  Or you can download it from here:

 Chanalyzer 3.0 User Guide PDF