All this is contained in the compressed file Visual LISP Projects.zip. This code should be unzipped to disk without modifying the folder structure.
Once this is done, the Visual LISP Projects folder should be added to AutoCAD's Support files search paths. This way for every new drawing the code contained in this folder's acaddoc.lsp file will be executed, automatically loading the utility functions that are used in the different example programs.
To execute the programs for a certain chapter the source code for that chapter must be loaded previously. The source code for the different chapters is included in the Chapters folder.