sigma_1.0-1_amd64.deb is the latest release, which can be installed with the instructions at
There are also instructions for Maven - https://sourceforge.net/p/sigmakee/wiki/Sigma%20with%20Maven/
Users should also see
Mac instructions - https://sourceforge.net/p/sigmakee/wiki/Sigma%20Setup%20on%20Mac/
Ubuntu - https://sourceforge.net/p/sigmakee/wiki/Setting%20up%20Sigma%20on%20Ubuntu/
Previously, sigma.war was the latest binary beta release. Users should get the latest full release, which is sigma-2-02.zip http://sourceforge.net/projects/sigmakee/files/Sigma/sigma-2-02/sigma-2-02.zip/download install it per the instructions in the zip file, then replace the sigma.war file in the 2.02 release with the latest.