Reproduce and note exact behavior:
Legacy or conflicting SteamVR add-ons (like ALVR or VR Input Emulator) can prevent a clean startup. How to Fix SteamVR Error 475 1. Run as Administrator The simplest fix is often a permission reset. Close the Virtual Desktop Streamer on your PC completely. Steamvr Error 475
Temporarily disable your firewall or antivirus to see if it is blocking the SteamVR communication port. Reproduce and note exact behavior: Legacy or conflicting