The Geant4-DNA extension is fully included in the Geant4 public distribution.

Refer to the Geant4 installation

Alternatively, for users who do not wish to install Geant4 by themselves, we also propose a
Geant4 Virtual Machine for VMWare™ or VirtualBox™ for Windows™ or Mac OS™, freely available for download at this link.

You may follow the updates of our Geant4 Virtual Machines for VMWare™ on Twitter @ Geant4VM


Note : our souce code is located in the $G4INSTALL/source/processes/electromagnetic/dna directory of Geant4.