Deep Diving VR is a standalone product, currently not available on GOG.
We're curious, where have you heard of Deep Diving Simulator having VR features, maybe there is a misunderstanding somewhere and we would hate to send the wrong message to our players.
It's in the recommended system requirements : "For QHD/4K resolutions and VR: GeForce GTX 1080, Radeon RX Vega with at least 6GB of video memory or equivalent"
so .. yeah .. I feel a tiny little bit cheated here, to be honest.