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 David Kohler:
This is not a game. It is an app designed to help real darts players play better, by reducing the number of turns to go out. It will help you, whatever your ability, from Poor to Excellent.When you first get the app you use it to measure your throwing accuracy and express this as a Darts Assistant Rating (DA Rating). The DA Rating is a number between 0 (hopeless) and 100 (perfect). Not even professionals will achieve a DA Rating of 100. It takes about 10 minutes to estimate your DA Rating carefully. But you only need to estimate it again if you feel your accuracy has improved (or deteriorated).Then, while a game is in progress, the Darts Assistant keeps score and uses your DA Rating to calculate the best target points, whatever the state of the game. It will also calculate your opponents target points, if you wish it to, based on his DA Rating. To get the most benefit from the app you should trust it completely. Don't second-guess the Darts Assistant, even when it indicates a target point that you think is illogical. This is because it uses mathematical techniques and calculations that are literally beyond the human mind to perform.For more information, please go to our website www.dartsassistant.com.