Where is OculusVRCValidator.exe?

Same here, the file does not exist in this location. I tried "repairing" the Oculus software to no avail. CMD inputs return the following message: "'OculusVRCValidator.exe' is not recognized as an internal or external command,
operable program or batch file."

Before 1.20 release, OculusVRCValidator was only distributed as part of PC SDK, but now it should be available as part of your standard oculus-diagnostics package.
If it is not there, please report the issue using "Provide Feedback" option in the Oculus app. Such report would include technical details that will give engineers more insight into what went wrong. 

Despite what the documentation says, it seems you need to download the PC SDK to get the validator. If you extract the contents to a folder, then use Admin Command Prompt to run Install.bat in "OculusSDK\Tools\OculusVRCValidator", the validator will be installed to "C:\Program Files\Oculus\Support\oculus-vrcvalidator". You can use it after restarting the Oculus application.

I hope that helps.

What are extra requirement for installing VRCValidator, i downloaded PC SDK & extracted oculus-vrcvalidator. Running \oculus-vrcvalidator does not bring me anything. it is not launching or same file in "C:\Program Files\Oculus\Support\oculus-vrcvalidator" this path .  please help.