Good evening Marty and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about Event Aggregator disappearing on you.
I would love to help you with this topic.
Actually, it is normal that Event Aggregator is not found in Downloads.
That’s because it is a service that does not require additional plugins to be installed (save for the Events Calendar).
It gets activated by ensuring you enter your license key ( https://theeventscalendar.com/license-keys/ ) properly.
You can read all about it here: https://theeventscalendar.com/knowledgebase/new-user-primer-event-aggregator/
Let me know if that helps.
Have a great day!
Geoff B.