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.
A Device that allows the user to kill ALL the zombies. Disclaimer: This device may need to be used multiple times to indeed kill ALL the zombies. Infection time may vary between humans, so determining zombie status is subjective.