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 Elliott Apps:
Ever been struck by lightning? Probably not right? ...If you have I would start avoiding lightning altogether. Well regardless, use Lightning Tracker and find out just how close you are to being struck!!Lightning Tracker displays your location on a map and tells you where in the area the lightning hit! There are only 2 steps!STEP 1: When you see the lightning press the "SAW LIGHTNING" button.STEP 2: When you hear the thunder that follows press the "HEARD THUNDER" button.The program then tells you how far away the strike is and shows you on the map! How awesome is that?!Thank you all for the support, please enjoy Lightning Tracker!