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 Mexico Tourism Board:
Visit Mexico App is the first iPhone travel app to provide nationwide coverage. Select from 6 regions, all 32 states, and in-depth information about 27 top tourist destinations. All content on the iPhone app is available in both English and Spanish. The iPhone app includes interactive features online news and weather, links to Google Maps of top destinations, and interactive games that make the app fun to use. The iPhone application is available for free download on iTunes.
