On your Workstation or "AdminPC" which also can be a VM for automated stuff.
Todays vCenter is a Appliance named VCSA and you could not or should not install software there. Also its not based on Windows anymore.
PS C:\WINDOWS\system32> $env:PSModulePath
C:\Users\ssmith\Documents\WindowsPowerShell\Modules;C:\Program Files\WindowsPowerShell\Modules;C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules;C:\Program Files (x86)\VMware\Infrastructure\PowerCLI\Modules
PS C:\WINDOWS\system32> Get-Module -Name VMware.PowerCLI -ListAvailable
You still seem to have an older, MSI based, PowerCLI installation on your station.
That needs to be removed first.
Follow the steps described in Welcome PowerCLI to the PowerShell Gallery – Install Process Updates
and Updating PowerCLI through the PowerShell Gallery
That 2nd link describes how to uninstall an old MSI-based PowerCLI installation.