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 P2 Mobile:
On This Day is the most comprehensive historic event app on the app store. On This Day contains over 1,000,000 events, births, and deaths in its database.Simply start the app and you are welcomed with todays historic events. To change the date, conveniently tap the screen. Youll love the amazingly simple interface. This app is an invaluable tool for history buffs!Features include:- OVER 1 MILLION HISTORIC EVENTS AVAILABLE RIGHT AT YOUR FINGERTIPS!- Simple and intuitive navigation.- Ability to bookmark events that interest you.- Includes events that range from over 2,100 years ago until today.