Hey folks (floydtaylor and readdie). Thanks for your post here and my apologies for taking until now to get you a reply. More importantly, sorry on behalf of the whole team for the confusion you’ve faced here. It’s apparent we need to do a better job of clarifying license keys and how to disconnect them from the offset.
The solution presented by readdie is exactly what must be done. We also published a blog post that walks through this, which you might find of value: https://theeventscalendar.com/finding-your-pro-license-key-re-downloading-the-plugin/. Let me know if you’re still stuck from there or if anyone has any further questions.