I am getting this same issue as well with ViveSR SDK 0.9.0.3. I have SteamVR 1.11.11 and was not able to get the ViveSR pre-built sample Unity apps to initialize see-through camera inside the app (The sample apps are called Vive_SRWorks and Vive_SRWorks_Demo specifically). My PC has met all the hardware/software requirements and I am operating with a Vive Pro headset. SRWorks runtime is installed a Program Files folder with full administrative permissions.