@James710 Based on what you said I reinstalled steam vr and disabled open composite.. The game now "runs"... but is a stuttery mess as others above (and elsewhere) have posted. Basically unplayable. Ugh.
The game doesn't work in any way for me (separate support issue). But hopefully to help some of the above posters have you tried Open Composite? It bypasses the Steam VR stuff (since using it I've uninstalled Steam VR). It worked great with Skyrim VR so will hopefully help some of your stuttering issues. Cheers