Setting the Server Edition in Windows Server 2008 R2 – Upgrading without media – TechNet Blogs

Upgrading Windows Server 2008 R2 without media – TechNet Blogs

Pay special attention as MAK keys span editions and result in a 1605 Error Code.

Instead of using the a MAK key use the generic KMS client key for Windows 2008 R2 Enterprise it is  489J6-VHDMP-X63PK-3K798-CPX3Y. This will not activate but later you can apply the proper key by Changing product key from Control Panel\System and Security\System or Right-Click of Computer –> Properties.

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