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 Canalino Software:
Only the Best Cars HD Wallpapers for your iPhoneMake beautiful and unique iPhone wallpaper with these wonderful carefully selectedAll are in HD resolution 640x960 +so perfect for each device.iPhone - All generationsiPod - Touch All generationsMORE THAN 100 HD WallpapersTO SEE OFFLINE (does NOT require internet connection) so you can change the background every time you want even if you do not have internet on your iPhoneONLY THE BEST QUALITYYou can try before you set it as shown in lock Screen or the Home Screen. Can send e-mail to a friend