Complete bundled installer, with Crescendo/Overture and 20-Sim
Zip bundles just containing Crescendo/Overture
Both types are available for 32/64-bit for Java. The current version is 2.0.x(May 2014). Please note that in order for being able to try using the Crescendo co-simulation feature you need to at least have a trial license for the 20-sim tool. When you start up 20-sim there is a Try button that you can press to request a trial license.