Rob,
Community Edition and Pro are part of the same binary, as was the case in prior versions with OSS and Pro. The open source core, on the other hand, is distributed as code. To use it, you need to compile it, deploy it, and move your content over. We don’t have a step-by-step guide for that at this point, but the high-level steps would be:
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Create matching configuration in your Core edition deployment (e.g. your repositories, permissions). With a small number of exceptions, configuration settings are accessible via REST API.
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Use wget or something similar to pull down your content from your existing deployment, and re-upload it into your new Core deployment.