Install RSAT for Windows Server 2019 and Windows 10 with PowerShell

Windows Server 2019

Run the cmdlet below with the -whatif switch to check what will is allready installed and will be installed:

Install-WindowsFeature -IncludeAllSubFeature RSAT -WhatIf
Get-WindowsFeature -Name RSAT* | where 'install state' -NE Installed

To install all the tools run the cmdlet below:

Install-WindowsFeature -IncludeAllSubFeature RSAT
Or
Install-WindowsFeature -Name RSAT -IncludeAllSubFeature -IncludeManagementTools

Windows10

Check whether RSAT components are installed on your computer:

Get-WindowsCapability -Name RSAT* -Online

View the status of installed RSAT components in a easy view:

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

You can use the Add-WindowsCapacity cmdlet to install these Windows features.
To install a specific RSAT tool, such as AD management tools (including the ADUC console), run the command:

Add-WindowsCapability –online –Name “Rsat.ActiveDirectory.DS-LDS.Tools~~~~0.0.1.0”

To install the DNS management console only, run:

Add-WindowsCapability –online –Name “Rsat.Dns.Tools~~~~0.0.1.0”

And all the other single install options:

Add-WindowsCapability -Online -Name Rsat.FileServices.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.GroupPolicy.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.IPAM.Client.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.LLDP.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.NetworkController.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.NetworkLoadBalancing.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.BitLocker.Recovery.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.CertificateServices.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.DHCP.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.FailoverCluster.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.RemoteAccess.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.RemoteDesktop.Services.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.ServerManager.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.Shielded.VM.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.StorageMigrationService.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.StorageReplica.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.SystemInsights.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.VolumeActivation.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.WSUS.Tools~~~~0.0.1.0

To install all the available RSAT tools at once, run:

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

To install only disabled RSAT components, run:

Get-WindowsCapability -Online |? {$_.Name -like "*RSAT*" -and $_.State -eq "NotPresent"} | Add-WindowsCapability -Online

If installing RSAT you encounter an error Add-WindowsCapability failed.
Error code = 0x800f0954, most likely your computer is configured to receive updates from the internal WSUS or SUP server.

To install RSAT components, you need to temporarily disable the update from the WSUS server in the registry.
Open the registry key HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU and change the UseWUServer to 0 and restart the Update Service.

Or run this script:

$currentWU = Get-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Name "UseWUServer" | select -ExpandProperty UseWUServer
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Name "UseWUServer" -Value 0            
Restart-Service wuauserv            
Get-WindowsCapability -Name RSAT* -Online | Add-WindowsCapability –Online            
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Name "UseWUServer" -Value $currentWU
Restart-Service wuauserv