RSAT 1809 and above Managed environment

installRsat.ps1

# RSAT 1809 in Managed WSUS environment
# Set variables
$wsusSetting = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU\"
$name = "UseWUServer"
$value = "0"
$service = "wuauserv"

If (Test-Path $wsusSetting$name) {
    # Get Current WSUS Settings
    $currentReg = Get-ItemPropertyValue -Name $name -Path $wsusSetting -ErrorAction SilentlyContinue
    # Set reg value and restart service
    Set-ItemProperty -Path $wsusSetting -Name $name -Value $value -Force | Out-Null
    Restart-Service $service -Force
    $wsusreset=$true
}

# Install RSAT
Get-WindowsCapability -Online | ? Name -like 'RSAT*' | where { $_.State -eq 'NotPresent' } | foreach { Add-WindowsCapability -Online -Name $_.Name }

# Reset reg value and restart service
If ($wsusreset){
    Set-ItemProperty -Path $wsusSetting -Name $name -Value $currentReg -Force | Out-Null
    Restart-Service $service -Force
}