Hey!
Thanks for reaching out to us!
You can continue to use the Facebook plugin for now, however we do recommend using the Event Aggregator plugin due to a much smoother import process as well as the additional options for other avenues to import (iCal, .ics, Meetup, etc. )
Since you had an active license for Facebook Importer, you’ll now have an active license for Event Aggregator which you can find here https://theeventscalendar.com/license-keys/.
Once you add that license to your site, you should be able to import using the new Event Aggregator!
Let me know if this helps.
Thanks!