3ds Max 2021.2 + Vray 5 Failed to Load

[rheinspiel]

Not sure if this is a deadline issue or Vray 5 issue atm or combination of the two. We are transitioning to 3ds Max 2021 and our current render jobs only work on 1/3 of our render nodes. All of the other render nodes get the following error: Error: FailRenderException : RenderTask: Unexpected exception (Failed to open the max renderer.
Could not read V-Ray environment variable “VRAY5_FOR_3DSMAX2021_MAIN”. Please re-install. I have re ran the Vray 5 3ds Max 2021 installer as "Admin" and still fails to render. Any thoughts or suggestions. I have also reached out to the Deadline team.

[rheinspiel]

Rebooted the Machine--->Reinstalled Vray 5---> Rebooted Machine and it works now!

[KramSurfer]

Same problem using the silent install method.

[hermit.crab]

I cannot seem to reproduce the issue. I've tried a silent install together with a deadline render but everything seems to work fine. Sometimes, a reboot is necessary for environment variables to function properly.
KramSurfer Are you able to systematically reproduce the issue with the silent install?