Hello,
Thanks for checking out Events Calendar Pro!
Unfortunately the recurring events feature is built in to Pro, and there is not currently a way to purchase only that feature. Purchasing a license for Pro means that you get premium support and plugin updates for one year, after which the support and updates end but the plugin itself will not be affected. You can continue to use it on your site, but over time you may run into compatibility issues if you continue to update WordPress and other plugins on your site and are still running an older version of Pro.
We do offer full refunds within 30 days of purchase, so feel free to take Pro for a test run! Please let me know if you have any other questions.
Thanks,
Jennifer