i can confirm this method is working : DISM /online /Set-Edition:ServerDatacenter /ProductKey:D764K-2NDRG-47T6Q-P8T8W-YP6DF /AcceptEula

Works when you use the iso linked in 'how to activate'

I purchased this Windows Server 2025 license recently and it worked well, thanks! The price is reasonable too. If you already downloaded the ISO from Microsoft, with the OS installed, run the DISM /online .... command using an administrator account as others said in the reviews, but with your own purchased key. Thanks again! I will definitely consider this company for my software needs in the future.

I purchased a Windows Server 2025 Datacenter key after installing the official ISO downloaded directly from Microsoft's website (Evaluation version). Before activating the OS with your purchased key, you must first upgrade the edition using the following steps:

How to Activate:
Click Start, type CMD, right-click and select Run as Administrator.

Enter the following command and press Enter:

DISM /online /Set-Edition:ServerDatacenter /ProductKey:D764K-2NDRG-47T6Q-P8T8W-YP6DF /AcceptEula

Wait for the process to complete (may take several minutes).

The server will automatically reboot.

Once restarted, go to Settings > Activation.

Click Activate Now, then Change Product Key.

Enter your purchased key and follow the prompts.

After activation, proceed with Windows Updates and you're good to go.

Super-Schneller Versand online direkt nach Bezahlung. Funktioniert auch mit deutschem Evaluierungs-ISO und anschließendem Befehl "DISM /online /Set-Edition:ServerDatacenter /ProductKey:D764K-2NDRG-47T6Q-P8T8W-YP6DF /AcceptEula", anschließendem Neustart - zum Schluss den gekauften Key eingeben. Aktivierung hat reibungslos funktioniert.