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.
Search for the best images across the whole internet. Search to reveal thumbnails before viewing the fuller version. iPad users see raw images as they should be. Save photos as part of your Photos collection to be used as wallpaper.