Currently, I don't have any installers for Mathwars, as this project is still under heavy development. I hope I can finish this project around June or July 2013. When this project is finished, I will upload the installers for Linux (DEB and RPM) and for Windows. For the moment, you can download the source code here.
If you are eager to test Mathwars, you can compile the source code and test it. In order to do this, you will need to have a working Qt instalation (4.5 or greater is recommended).