You might want to install Active Directory Users and Computers on another server other than a Domain Controller. Rather than using Server Manager and the cumbersome GUI its possible to install it with 2 simple Powershell commands.
On the server you want to install ADUC on first of all launch an elevated PowerShell session. Then once open we need to import the Server Manager module. To do this enter the command below :-
As you can see there is no feedback when its complete. Once your back to the prompt its good to go.
Then issue the command :-
Your get a progress bar this time as it installs. If the system doesn’t recognise the command Add-WindowsFeature then you most likely didn’t import the server manager module.
Once done it will confirm its all installed and no restart is required.
You should now find Active Directory Users and Computers installed on the server.