Development version (the whole repository):
git clone http://github.com/vmc-project/geant4_vmc.git
To switch to tagged tagged version 4.0.p1:
git checkout v4-0-p1
To switch to old tagged version 3.6.p3 (compatible with Geant4 10.04.x):
cd geant4_vmc
git checkout v3-6-p3
The list of new developments, bug fixes and the required versions of ROOT and Geant4 for each version can be found in the history file.
Download Geant4 - from the Geant4 Web site