This error usually happens if your server is currently operating as an Active Directory Domain Controller (DC). Microsoft blocks edition upgrades on live DCs.

Only download ISOs from official Microsoft sources. Third-party sites often host compromised versions.

There are two legitimate ways to ensure you are running the full, non-evaluation version:

How to Convert an Existing Evaluation Installation to Full Standard (Non-Evaluation)

First, confirm that your system can upgrade to the Standard edition by running: DISM /online /Get-TargetEditions Use code with caution.

Finding a legitimate, full version of the Windows Server 2016 Standard ISO that is not the 180-day evaluation can be challenging, as Microsoft heavily promotes its evaluation center. For production environments, businesses require a permanent, licensed installation. This article guides you through obtaining the correct ISO, the differences between editions, and how to convert an existing evaluation to a full version. Why Avoid the "Evaluation" ISO?

For , use one of these:

Log into the or the Microsoft Volume Licensing Service Center (VLSC) .

Windows Server 2016 standard support has ended, but extended support continues for security updates.

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

If your company has a Volume License agreement, this is the primary source.

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