Hey Kat,
Thanks for reaching out to us!
You can find your available plugins for download by visiting https://theeventscalendar.com/my-account/downloads/ while logged into your account here.
From there, you can download the zip file for the Eventbrite plugin and upload into your WordPress site. Once uploaded and activated, you should see the option for adding your license key for the plugin under the Events > Settings > Licenses tab. The license added there will give you access to the automatic updates of the plugin when they’re available.
Let me know if this helps.
Thanks!