How to update ShowdownVR Demo game to the latest OSVR-Unreal plugin source?

Development Pipeline & Plugins Plugins
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1

How to update ShowdownVR Demo game to the latest OSVR-Unreal plugin source? Is it same as Unreal Engine 4.12. For example, GitHub - OSVR/OSVR-Unreal: OSVR plugin for Unreal Engine
Thank you.

2

Unreal Engine 4.13 Preview is the platform.