Here’s how to install Telnet on Windows Server using the Command Line on Windows Server.  Applicable to Windows Server 2008 and Server 2008R2.  Most likely applicable to later version of Windows Server but has not been tested or confirmed.

Step 1

Open a command prompt as an administrator

Step 2

Type in the following:

pkgmgr /iu:"TelnetClient"

If a UAC prompt appears confirm the action.  When the command prompt appears the installation is done.