The Download Now link directs you to the Apple iTunes Store, where you can continue the download process. You must have an active iTunes account to download the application. This download may not be available in some countries.
From Orave Technologies:
Reverse Lookup is a free reverse phone lookup app that lets users perform a lookup on any phone number. When a lookup is performed, this app retrieves all available information for that phone number, including the name. The main purpose of this app is to allow users identify any unknown caller, so they have the knowledge of who they are dealing with. In addition to providing the information associated with the phone number, this app also verifies that it has the latest and the most accurate information on that phone number.