So I went down the rabbit hole of going to the website. Guess what happens when you click the book link? "Your server is running PHP version 5.6.40 but WordPress 6.3.2 requires at least 7.0.0" [0]. Not sure how this fell through.
[0]http://www.markrussinovich.com/books/rogue-code/ [1]https://imgur.com/a/YYJJ9xD