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 Saltamonte Labs:
Theres a lot of information in every tennis match, and TennisScope is here to help you mine that information and help you improve your game. Capture every shot in every game of your matches, and with that information you can instantly see many of the same stats the professionals use to hone their game. You can also view your games in a new and original graphic format that lets you see the patterns in your play and in the play of your opponents. For example, are you a leader or a follower? Do your service games tend to be shorter or longer, and do you spend too much time playing catchup? TennisScope is a new tool that can help answer these and many other questions that any serious player and her or his coach should be asking.
New version can operate in conjunction with companion app "Scoreboard for TennisScope". Scoreboard for TennisScope displays the current score and details of the last point played on an iPad, with the information transmitted via a WiFi connection.