To configure and install Windows 10 1903 RSAT using powershell follow the below commands.

In Powershell administrator:

Get-Command -Noun WindowsCapability

Get-WindowsCapability -Name RSAT* -Online

Get-WindowsCapability -Name RSAT* -Online | Select-Object -Property DisplayName, State

Get-WindowsCapability -Name RSAT* -Online | Add-WindowsCapability -Online

Get-WindowsCapability -Name RSAT* -Online | Select-Object -Property DisplayName, State

Update-Help