How To Upgrade Windows Server 2008 R2 Standard Edition to Enterprise Edition

 

First open up a command prompt with administrative privileges.

 

 

 

Then,

 

 

• To determine the installed edition, run:

 

DISM /online /Get-CurrentEdition

 

 

• To check the possible target editions, run:

 

DISM /online /Get-TargetEditions

 

 

• In order to upgrade the server, run the following command:

 

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

 

 

• Notice the "edition ID" should be one of the outputs from "DISM /online /Get-TargetEditions"

Such as  "ServerDatacenter" or "ServerEnterprise"

• ProductKey should be a generic key assigned by Microsoft. This is a KMS key. Use the following key: 489J6-VHDMP-X63PK-3K798-CPX3Y

Example:    DISM /online /Set-Edition:ServerEnterprise /productkey:489J6-VHDMP-X63PK-3K798-CPX3Y

Here is the link for the official site that holds the keys:
https://technet.microsoft.com/en-us/library/jj612867.aspx

• After applying the command below, reboot your server and notice that the server is upgraded and awaiting activation. You can enter your own key and activate the server.

PS: you can not do these on a DC. Demote the domain controller first, then upgrade.