Are you trying to download the latest version of the plugin or an older version? It looks like the URL there is linking to 3.9.3, however it doesn’t seem to appear within the available downloads when I’m testing the downloads on the site.
I apologize for the inconvenience here. I’ve created a new license that should give you full access to the current versions of the Eventbrite Tickets plugin now. Login to your dashboard and you should now have a second license section there with the ability to download the latest version.