Yeah sadly it doesn't work anymore, and I imagine the SDK is so different that you'd need to heavily rework the VR version. Still a great game despite this though.
Sorry...
To update the game I have to open it with an very old version of Unity, the project is not compatible with the new version of the engine.
After all it's an old project (started in 2015), if i wanted to work on it again, i would almost have to restart from scratch (update engine and graphics, adding items, patch some UX problems, ...)
But... who knows... maybe one day :-)