The downloads page (http://www.jboss.org/savara/downloads) has a link to installation instructions at the top: https://docs.jboss.org/author/display/SAVARA/Installation+Instructions
The most recent version of the update site for the BPMN2 editor, which includes some fixes, can be found here: http://download.eclipse.org/bpmn2-modeler/site/0.2.5/
Just a note - the BPMN2 modeler had a problem saving models produced by Savara, because it didn't cope properly with the use of default namespaces. A quick patch to Savara is currently being tested that uses explicit namespace prefixes, which works better with the BPMN2 modeller. So the current versions should allow you to display, but you may find problems making changes to the BPMN2 model and saving them.