The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Fetal Diagnostic Center:
Because the main story of the Book of Mormon covers over 1,000 years, it may be difficult for some to remember the relationships between the many stories and events that comprise the 15 books contained within the Book of Mormon. The purpose of this application is to provide the reader with quick access to bullet point summaries of each of the chapters contained within the 15 books so that an overview of the entire history of the Book of Mormon may be more easily understood. If the user is connected to the internet, there is an easy link to the full text of the Book of Mormon.