Hey Chris,
Welcome to our Pre-Sales Questions forum and Happy New Year! Whoever originally purchase the license for Events Calendar PRO should have received emails leading up to their license expiration date prompting them to renew at a discounted price.
If you need to purchase a new license, you can do so by visiting the Events Calendar PRO product page and going through the checkout process. Once you’ve done that, you should receive an email providing instructions on how to access and set up your new license key.
Please let me know if this helps answer your questions and have a great evening. Cheers!