The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Chris Marquardt:
Learn some of the important concepts of photography: - Foreground / Background- Sensor Dirt- Lens Types- Panning Shots- Bokeh- JPG / RAW / TIFF- Lens FAQTry everything out with the flick of a finger in this interactive book by photography instructor Chris Marquardt, host of Tips from the Top Floor. PocketChris is the photography instructor in your pocket, helping you learn about photography in a brand new way! Reading about settings and the effects they result in is one thing. Actually seeing the effects with your own eyes is something entirely different. Learn the visual way! PocketChris Advanced Photography II picks up where the popular PocketChris Basic Photography and Advanced Photography I left off. And as usual, PocketChris brings you easy-to-digest chapters of bite-size information that cover photography in simple to understand language.