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 The App Company:
DocuApps presents the full text of The Civil Rights Act of 1964, which remains one of the most historically important bills enacted during the civil rights movement of the 60's. DocuApps provides the unabridged text of the bill along with DocuApps amazing tools for reading, researching and sharing this document. DocuApps allows users to research using Wikipedia and top search engine tools from directly inside the document, right at the point where you are reading. You can also easily highlight passages and email them to friends and colleagues. Additionally, you have a broad range of ability to customize the look and feel of the text to your own liking. DocuApps also maximizes the page reading view with no ads or tools on the reading page. DocuApps is changing the way we read, research and share useful and important documents.