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 Daniel Aisen:
First developed as a student project in the Stanford University iPhone Application Programming class, Perfect Play Blackjack is the first iPhone app to provide precise, real-time blackjack situational odds and analysis. Whereas other card counting apps on the market employ naive card counting strategies that only give a crude estimate of how to play, Perfect Play Blackjack utilizes the raw computing power of the iPhone via state-of-the-art combinatorial techniques to provide the absolute best blackjack strategy in any situation! Features:Track all aspects of a blackjack game including player cards, dealer cards, and other cards used at the tableCalculate best play and odds based on cards remaining in the deck in every situationPlay blackjack against the computer by having the application choose cards randomlyTrack the current card count with various systems including Hi-Lo, Hi-Opt I/II, Zen, and Omega IISupport for 1-8 decksFast mode (recommended) approximates odds (+- 0.5%) almost instantaneouslyPrecision mode employs a comprehensive simulation to find exact statistical odds I encourage users to contact me at email@example.com with any comments, questions, or suggestions.