These are the remaining chapters of the book. Once you have downloaded the chapters, you will need a second unique password to open the pdf file, the password for chapter 2 is in chapter 1, and the password for chapter 3 is in chapter 2 etc. This is to ensure that you read all the chapters in sequence. If you find this too much of a bother you can always purchase an e-book version or a paperback copy. They are both significantly cheaper and less hassle than downloading and printing the book chapter by chapter!