There is no such thing as a permanent "free product key" for Windows Server 2016 Standard. Using keys found on the internet often violates Microsoft's Terms of Service and can result in the server deactivating later.
You're looking for a free product key for Windows Server 2016 Standard Evaluation. Here are some details: windows server 2016 standard evaluation product key free
Note that this is for evaluation purposes only and will expire after 180 days. For full functionality, consider purchasing a license and upgrading to the full version." There is no such thing as a permanent
If you decide to keep your server and have purchased a genuine license, you cannot simply enter the new key into the "Activation" settings. You must use the Deployment Image Servicing and Management (DISM) tool to convert the edition. Open (Admin). Here are some details: Note that this is
To activate Windows Server 2016 Standard Evaluation, follow these steps: