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.
The new iPad's high resolution Retina Display is remarkable! But none of your old photo/wallpaper look all that great on your new iPad! Retina Booth will do scaling on your photo/wallpaper to fit Retina Display's high resolution - double the width and height of your photo/wallpaper. With Retina Booth, you can create your stunning Retina photo/wallpaper for your new iPad with your old low resolution photo/wallpaper.