You can use the following one line of PowerShell to easily install all of the available Remote Server Administration Tools (RSAT) in one go. I end up running this after every Windows feature update. Saves wasting time with a GUI.

Open an admin PowerShell prompt

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

Individuals Tools

If instead you only want to install a single tool or a small number. This command will give you a list of all of the available RSAT tools

You can then install the individual tool using

Add-WindowsCapability –online –Name "<tool name>"

i.e

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

Checking the install status

          This command will show which tools (if any) you currently have installed

• Present = Installed
• Not Present = Not installed

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