You can download NVIDIA VRWorks For Unreal Engine 4.13 on GitHub for free. As stated in the past, you’ll need a free Unreal Engine Github account to access the UE4 GameWorks integrations.

NVIDIA has made it easier than ever for game developers to add leading-edge Virtual Reality technology to their Unreal Engine 4 (UE4) games by providing custom UE4 branches for NVIDIA VRWorks technologies on GitHub. VRWorks is a comprehensive suite of APIs, libraries, and engines that enable application and headset developers to create amazing virtual reality experiences. Access UE4 GameWorks Integration:
In order to access the UE4 GameWorks integrations, you will need a UE4 / GitHub subscription.
Multi-Res Shading UE4.11
Multi-Res Shading UE4.12
Full VRWorks Graphics UE4.12 (Includes Multi-Res shading, VR SLI, Single Pass Stereo and Lens Matched Shading)
Multi-Res Shading UE4.13
Full VRWorks Graphics UE4.13 (Includes Multi-Res shading, VR SLI, Single Pass Stereo and Lens Matched Shading)

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Source: [H]ardOCP – NVIDIA VRWorks For Unreal Engine 4.13 Now Available For Free On GitHub