Use the paypal button below. I'll email you the download link. Make sure your email address used for paypal is correct. (you can contact me via tweeter https://twitter.com/xah_lee )
Free update for 2 years.
The format is plain HTML files, just as you see on the website. No ads. Viewing pages is instantaneous.
The order is manually processed by a human (me). Please allow 24 hours to email you.