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 NFL Enterprises:
Get the official Super Bowl commemorative app of Super Bowl XLVI. The app includes each team's road to Super Bowl XLVI, a breakdown of the game, written recaps and key stats, and bonus feature content like all-time, all-star teams and Super Bowl history. When the game is over, celebrate Super Bowl XLVI with official video highlights of the game as well as interviews, pictures, animated plays, stadium shots and much more. This must-have Super Bowl app includes:Great NFL.com videoEach team's road to Super Bowl XLVISuper Bowl HistoryBonus features when Super Bowl XLVI is over