The Download Now link directs you to the Windows Store, where you can continue the download process. You must have an active Microsoft account to download the application. This download may not be available in some countries.
From Transis Informatica:
Bluetooth shortcut tile This application allows direct access to Bluetooth settings from your home screen. You can pin Bluetooth settings to the Start Screen, allowing you to quickly go and turn on/off this feature. Windows Phone doesn't include quick toggles for settings like Bluetooth, but we add that feature. Digging into settings every time you want to turn Bluetooth on/off is a pain, and this app brings it right back to your fingertips.