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You selected the issue: "VRApplicationError_IPCFailed"
Troubleshooting:
Some software has been found to conflict with SteamVR or SteamVR driver installations. If you have any of the following software installed, try uninstalling it and re-testing:
  • Razer Synapse
  • Asus AI Suite
  • Avast antivirus
  • JDS Labs ODAC USB Audio device
  • Older Apple Cinema displays with devices attached through USB
  • TP-LINK 300Mbps Wireless N PCI Express Adapter TL-WN881ND