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.
From Roambi:
Roambi Analytics empowers business users by transforming the critical information they use into stunning visualizations delivered to their iPhone or iPad - anytime, anywhere. Designed for connection with many different business intelligence products and data sources, Roambi Analytics is an enterprise-grade app that provides businesses of all sizes with the ability to quickly share the information business users need.
