Hello Richard Warner,
Thank you for using our services.
You can either upgrade your community edition website to standard edition, or choose to export the website content. Both approaches are pretty straightforward. In order to upgrade the website just download the upgrade patch for Sitefinity 3.7 SP3 Standard edition and follow the Upgrade Instructions
. Note that you should completely replace the bin and Sitefinity folders (and merge your changes to the control templates if you have any). Also if you have modules built referencing the community edition assemblies, you should rebuild those modules to reference the SE ones.
The second option would be to simply create a website export by going to Administration -> Tools -> Export
and create a site export.
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