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 Samuel Shelton:
** Owners of devices older than the iPhone 4S and iPad 2 may experience performance issues with version 1.0 of this App but an update with performance enhancements will soon be on the App store **ULTIMATE RETRO ARCADE: Relive the highly-addictive and ultimate retro arcade games of the 70s with Retro Sports! Play the classic sports of tennis, football and squash along with the all new Squash Challenge: return the ball as many times as you can as it increases to extreme speeds! Retro 8-bit sound and retro font all round puts you right back in the arcades of the 70s.INTELLIGENT COMPUTER: Intelligent computer that plays differently with every serve or kick-off. Challenge the computer on easy, medium, hard or extreme.MULTIPLAYER AND GAME CENTER ENABLED: Challenge your friends to a game of tennis or football on the same device. Challenge your friends online with Game Center Leaderboards and Achievements. All Game Center high scores and achievements are cached on the device so that even if you're not connected, as long as you're logged into Game Center you're competing!ENJOY THE RETRO FUN ON ALL YOUR IOS DEVICES: All the Retro Sports games are rolled into one universal App so that you can enjoy the retro fun on all your iOS devices!PLEASE NOTE: Retro Sports requires all devices to be running iOS 5.0 software update or later.