The download area is at :
http://wall.lal.in2p3.fr/download
Here can be found some binary kits according to platforms we have at hand, but the general policy is that you have to get the source kit and rebuild a binary kit by yourself (see the build section for that).
If having a binary kit at hand, unzip it and follow the "Run locally" instructions in the "Build and Run" section to start straigh a local "wall session".