How to Convert Windows Server From Evaluation Version to Full Version Using DISM

This is a complete guide to convert your Evaluation edition of Windows Server into a Full, properly licensed version using a legal product key and the DISM command. Make sure to accurately follow our steps in order to achieve the desired end result.

Start your system and open the Command Prompt

Press the Windows + X keyboard shortcut, then select Command Prompt (Admin).

Check the current version of your system using the following command: 

DISM /Online /Get-CurrentEdition

Next, enter this command into the Command Prompt and press the Enter key. Make sure to read our explanation below the command and replace the marked areas as
needed: 

DISM /online /Set-Edition: ServerEdition /ProductKey: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula

If you’re upgrading to the Standard edition, replace ServerEdition with ServerStandard.
If you’re upgrading to the Datacenter edition, replace ServerEdition with ServerDatacenter.
The string of X characters is the place for your product key .

At the command prompt for the Essentials version, enter the following directly:

DISM / online / Set-Edition: ServerEssentials / ProductKey: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX / AcceptEula 

* here replace placeholder with product key

In the command prompt for the standard version, enter the following directly:

DISM / online / Set-Edition: ServerStandard / ProductKey: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX / AcceptEula 

* here replace placeholder with product key

Enter the following directly into the prompt for the Datacenter version:

DISM / online / Set-Edition: ServerDatacenter / ProductKey: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX / AcceptEula 

* here replace placeholder with product key

Wait for the loading to complete. This may take a long time – ensure that you don’t turn your computer off while the process is ongoing.
Your computer may restart on its own several times, or prompt you for permission to restart — in this case, press the Y button on your keyboard.