Windows Server 2016 Essentials key is meant to be used on the Microsoft website. Download URL (ISO File): https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server Note: In order to convert Windows Server From Evaluation Version to Full Version Using use this DISM command: 1. Open CMD (Command Prompt) as Administrator 2. You can check the current version of your system using the following command: DISM /Online /Get-CurrentEdition 3. Use this command to convert Windows Server from Evaluation Version: DISM /online /Set-Edition: ServerEssentials /ProductKey: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula