Cannot install VMware tools using powercli

I gave this command to install vmware tools

Get-VM VMname | update-Tools

I am getting error
“cannot complete operation because vmware tools is not running in this virtual machine”

but when i try to install using vsphere client its installing. Please help

This is really a question probably best answered by the folks at VMware, but my understanding is that Update-Tools can only UPDATE the tools, not initially install them.

Thank you.