Thanks for writing us about this, and I'm sorry for the confusion. Currently, the only download available for this book is a color PDF of the images from the book. You can download the PDF at http://cdn.oreilly.com/oreilly/Designing_Data_Visualizations_figures.pdf. I've removed the Download Example Code link because it was confusing. Also, I'll check with the authors to see if there are example files we should make available.