The files can be found in the temp folder C:\Users\<username>\AppData\Local\ChaosGroup\telemetry .
Enable Feedback Program
The Feedback program is enabled by default when you run the installer. After a successful installation on the last page there is a checkbox toggle Help us Improve V-Ray for Unreal to enable or disable the customer feedback program.
Feedback Program Settings
Collection and transmission of usage statistics can be disabled or renewed at any time through the V-Ray Project Setting in Unreal