Target the Standard edition: DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula Security Warning
Many users download the free evaluation ISO and later decide to keep the server. You do not need to reinstall the OS to move from the evaluation to the licensed Standard edition. You can use the Deployment Image Servicing and Management (DISM) tool. Open PowerShell as Administrator. Check the current version: DISM /online /Get-CurrentEdition windows server 2016 r2 standard download iso 64 bit free
Always use a genuine 25-character product key to activate your 64-bit Windows Server 2016 environment. To help you get started with your setup: Open PowerShell as Administrator
Before you begin the download, ensure your hardware meets the minimum specifications for the 64-bit architecture: 1.4 GHz 64-bit processor. An Ethernet adapter capable of at least gigabit throughput
An Ethernet adapter capable of at least gigabit throughput. How to Convert the Evaluation to Full Version
You can download a 180-day trial version for free. This is the full version of the software, designed for testing.