Hi AH,
Have you tried the rest of our suggestions in this article:
http://support.brillkids.com/entries/21388983-What-to-Do-When-You-Have-Problems-Downloading-Courses-on-Little-Reader-TouchFrom the suggestions in the article, I would recommend that you try to keep your iPad fully charged and "awake" during the entire download process - it could also help to keep your iPad plugged in to power.
You may also try resetting the download and try re-downloading (suggestion #6 in the article).