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Upgrading Windows Server 2012 Standard as Domain Controller to Datacenter

I mistakenly installed Windows Server 2012 Standard Edition in a virtual machine. A contractor arrived and promoted it to be the new domain controller. All was well until the next day I attempted to activate Windows and realized it was the wrong version (we have a volume license). The previous domain controller is still online, but the new one is the primary. There is also another server that is the backup domain controller.

How can I upgrade the new domain controller from 2012 Standard to 2012 Datacenter? I know I can upgrade Standard to Datacenter if not a DC using powershell. Can I demote the DC, upgrade it, and promote it back to a DC? Would that work? Thanks. Oh. All servers are on the same subnet. The DC is also running our DNS and DHCP services.

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Syed Muhammad Usman

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The key for me in getting this resolved was the confirmation of which DC held the FSMO roles. Using the netdom query fsmo did the trick as I found that the Schema Master role was not where I thought it was. I was able to transfer that role to the desired DC and then I was able to transfer the other roles to the same desired DC. Now I can upgrade the 2012 Std server after demoting it. Thanks Syed.