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.
Are you a frog lover that needs to save every frog from certain doom of abandonment? Start freeing the frogs and getting them bast the logs to their lily pads home.
See how many frog you can save before loosing them all.