I had no trouble downloading Books 1-5 but couldn’t download this one. Here’s what I did to get it: In iTunes, I clicked the little “v” arrow next to “Download” and I copied the link. I went back to my web browser and pasted it into the URL space. It brought me to a web page where I could click a “View in iBooks” button instead of “Download” button. After I chose to view it in iBooks, I got a screen in *iBooks* not in *iTunes* and once I clicked “Download” on that screen the download began and worked perfectly. I had to do the same for Book 6.

Thank you for the Awesome Earth.