Hi Trish,
Thanks for taking the time to reach out to us here! Oh no–what a situation! I’m so sorry to hear about it! 🙁
I’m pleased to report that swapping license keys for any of our premium plugins is a painless process, and you won’t need to perform any complicated extra steps, such as reinstalling your plugins. Simply log in to your WordPress site’s backend after purchasing, navigate to Events > Settings > Licenses from the WordPress sidebar, and enter your new license key in the provided field for Events Calendar PRO. Save your changes, and you’re all set! There’s no need to reenter any events or plugin settings, and your regular access to plugin updates through WordPress will be restored immediately. Let us know if you should have any questions or concerns as you’re working through the steps–we’d be more than glad to assist. 🙂
I hope that helps to get you on your way here! Thanks again, and please don’t hesitate to follow up if there’s anything else that we can do to assist!