Good evening Erika and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
The Events Calendar Pro and Event Aggregator are actually 2 separate products.
We offer a plugin suite based on a modular approach.
The goal being to keep things affordable for everybody and make sure our customers only pay for features that they are using.
With that in mind, we do offer bundles that include several of our plugins: https://theeventscalendar.com/bundles/
To get an Event Aggregator license, simply head over to the following page and complete the purchase process: https://theeventscalendar.com/product/event-aggregator/
Once that is done, you can read the following to set it up: https://theeventscalendar.com/knowledgebase/new-user-primer-event-aggregator/
Let me know how that goes.
Best regards,
Geoff B.