The DaVis 7.2 version has been released in 2006, and although the developers still have it in their portfolio, it can't be downloaded from their website for free, unless you own a license or acquired the product. I am saying this because I've seen a Login button on their website which I believe it takes you to the customer area from where the products can be downloaded once they've been purchased.
Better get in touch with the developers to obtain additional information. They are located in some key parts of the world for easier access and contact: http://www.lavision.de/en/contact.php
