Hi it’s me Al,
This is a quick post how to use DISM Online to change the product key of a Windows Server 2012 R2. Sometimes you’re not able to change the key using the GUI. This is how to do this using DISM:
1. Run powershell or a cmd as Administrator
Use DISM /online /Get-TargetEditions to list available editions for upgrade. To upgrade from evaluation to standard use DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
2. Use the command DISM /online /Set-Edition:ServerDatacenter /ProductKey:XXXX-XXXXX-XXXXX-XXXXX-XXXXX/AcceptEula
3. Reboot the Server
Cheers.
Al
blog.alschneiter.com 
I don’t want to upgrade. I simply want to use the DISM command to replace the current ProductKey on the existing system.
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Hi, you could use slmgr.vbs (run cmd or PowerShell as admin):
– Display the key: slmgr.vbs /dli
– Change the key: slmgr.vbs /ipk #####-#####-#####-#####-#####
– Uninstall the Product Key: slmgr.vbs /upk
Cheers,
Al
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