A new installer towards finalizing and upgrading DIVA-GIS is available both from this site and CIP (http://diva.riu.cip.cgiar.org. The source code is - temporarily - available from the udig site at http://udig.refractions.net/confluence/display/COM/Luis or try with subversion plugin in Eclipse http://svn.geotools.org/udig/trunk/community/lavila/plugins/.