On this webpage you will find a link to the bonus chapter for the book MacOS High Sierra for SENIORS. In Appendix C Opening a Bonus Chapter of the book you can read more about the supplemental content and how to open a PDF document.
Bonus Chapter Downloading Apps and Music
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Viewing PDF files
How can I view a PDF file?
You can download, open, view or print a PDF file in Windows 10 directly using Edge (the Internet browser program that comes with Windows 10). If you do not have Windows 10, you can use a program called Adobe Reader. If your computer does not have this software installed, you can download Adobe Reader for free from the Adobe website. You can learn how to download and install Adobe Reader on the following web page: www.visualsteps.com/adobereader