Note to self. I needed to install RSAT on a build agent, so using the “optional features” GUI was not possible.
Get a list of RSAT components:
Get-WindowsCapability -Name RSAT* -Online | Select-Object -Property Name, State
Install what you need, e.g.:
Add-WindowsCapability -Name "Rsat.GroupPolicy.Management.Tools~~~~0.0.1.0" -Online
