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

Refer to the Geant4 installation
instructions.

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

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