I had to delete the Event Tickets Plugin via ftp to bring my site back up.
My fatal error message with the update today was:
Fatal error: Declaration of Tribe__Tickets_Plus__Commerce__WooCommerce__Main::get_attendees() must be compatible with Tribe__Tickets__Tickets::get_attendees(WP_Query $attendees_query, $post_id) in /home1/khedives/public_html/wp-content/plugins/event-tickets-plus/src/Tribe/Commerce/WooCommerce/Main.php on line 8
Did not think I would get fatal error with update so I did not download existing version first – thus had to delete.
Tried restoring the previous version I had saved in a recent backup of the whole site and that did not bring site back up so just had to delete the plugin – and waiting for announcement this issue fixed and I can reload the Event Ticket Plus back on my site.
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Reporting the same issue as: https://theeventscalendar.com/support/forums/topic/fatal-error-of-event-tickets-plus-woocommerce/