Try connecting to the DK2 in the latest Oculus software. You won't be able to follow the Rift set up but if the headset shows a connection in 'Settings > Devices' then you should be able to connect in the latest version of Vizard 5. See the
Oculus page and Getting Started section for more information. Minor version Vizard upgrades are included without charge. From within Vizard go to 'Help > Check for Updates'.