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 Michael Chau:
This is the ultimate prank application. You can scare the pants off of your friends. The premise is that this just one of those Magic Eye Stereogram application where if you stare at the image for a while you will see a hidden 3D image inside of it. To make them less suspicious, you can even click on the i (info) button to open up the information window where it shows what the hidden 3D images looks like. Tell them that the best and quickest way to see the hidden 3D image is to stare at the image without blinking. They should be able to see the hidden 3D image in about 15 seconds or so. They will very briefly see the hidden 3D image for about half a second. Then, the scary image will popup with a loud scream. This FREE version contains the Magic Eye and scary images of Angelina Jolie, Brad Pitt, Julia Roberts and George Clooney. WARNING: This application is not for the weak of heart!!