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 New Mediology:
Last clock is a personal piece of media art that keeps you in factual time, human time and remote time. Just like any analog clock, Last clock has three hands: one for seconds, minutes and hours. The hands are made of a slice of live video that gets scanned to the clockface. With different refresh rate for the three hands, the three time circles reflect the rhythms of the space at different temporal resolutions. It is possible to stream the last clock camera feed over the internet from another iPhone or iPad. Connecting to a meaningful remote location, one can see glimpses of the pace of the place together with the time, some kind of presence without succumbing to surveillance.