In my non-prod environment I installed the server version of Confluence for evaluation. I have since purchased the Data Center version and, per the instructions on Atlassian site, upgraded the server version (option 3) to Data Center version 6.12.0.
The problem is when I try to apply my non-prod Data Center license to the upgraded Confluence it still thinks it's running a server version and won't allow me to apply the new license.
You can try manually updating the license by following these steps: https://confluence.atlassian.com/confkb/how-to-change-the-confluence-license-in-confluence-cfg-xml-720405151.html
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