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 Titanbase Productions:
Highlight your iPhone or iPod Touch and show off the spectacular display with Ultimate Screensaver Collection Pro! Features: Beautiful, artistic and interactive displays! 4 new screensavers in this version! Tap the screen for unique interactions in each design! Select your screensaver from your App Settings screen: Aquarium, Starfield, Autumn, Waterfall and multiple Holiday Screensavers including Valentine's Day, Halloween, Easter and Fourth of July Fireworks! Listen to music while you watch! Start your music, click the Home button, then start the screensaver. The Ultimate Screensaver Collection also works with Pandora, so you can watch while you listen! The Ultimate Screensaver Collection includes all of the latest Titanbase Screensavers, in addition to exclusive Ultimate only editions! When you are done with the screensaver, click the Home button to exit! Free screensaver updates!