The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Hart Ventures:
Explore the beauty of the universe with Your Star, an amazing Star Dedication locator for your device.Your Star bottles both the awe of heavens splendor and the steady march of history together so that lovers, relatives, and friends can consecrate a monument to their relationship in the stars.Your Star shows the sky in 3D, like you see it at night time exposing a collection of over one million of stars. It enables to point your device at the sky and see what stars, constellations, planets or deep space objects have been dedicated in real time.