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 Most Advantageous:
POWERFUL KEYBOARD SHORTCUTS TO MOVE & RESIZE YOUR APP WINDOWS:- Move & resize windows and they glide smoothly across the screen.**- Move a window and it snaps into alignment, making it easy to neatly arrange your screen.**- Jump windows directly to screen edges filling half or quarter of the screen.- Shortcuts to instantly Maximize, Center & More!** These features are unique to Window Keys and are the most intuitive way to arrange your application windows.Window Keys is for people who want to breeze through their work without the interruptions of fiddling with a mouse to then click and drag windows around - now that's a drag!