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 John H. Meyer:
Looks like you've discovered "iPhone 4 Flashlight Free!" (Your iPhone 4 just got a lot better)With "iPhone 4 Flashlight" for the iPhone 4, you can now have a portable flashlight everywhere you go. "iPhone 4 Flashlight" includes: - An elegant, easy to use interface - An "easy to tap" button to toggle the light on/off - Last but not least, updates for life!!!!!! -Send us your suggestions, and we'll make them happen!! - We have already completed our first update that will be submitted to the AppStore with many new features!!DISCLAIMER: Continued use of the flash may decrease battery life