Click left icon or use the right menu "Stable release" to download the current stable version of the community edition which is free for non-commercial purpose. This Java version of SCaVis runs on Windows, Linux and Mac and supports Java, Groovy, BeanShell, Matlab/Octave, and Jython scripting. Read the installation instructions. This version is included to jPort Java desktop. To enable the SCaVis-Pro edition, the downloaded version should be activated using the menu [Help]-[Activate].
The current unstable version which includes new features and updates can be found in the right menu All releases. You can also find historic versions released since 2005.