I have no idea what the correct method is to go about reporting a bug, it seems very difficult to do so. I just updated my WordPress site to version 4.6.14 (free version) and my site immediately went down with 500 response errors. I found this in my website logs:
[18-Apr-2018 17:13:28 UTC] PHP Parse error: syntax error, unexpected ''page_on_front'' (T_CONSTANT_ENCAPSED_STRING) in /home/www/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Front_Page_View.php on line 93
I was able to fix the issue by manually editing line 93 of the source from:
$does_not_have_data = empty( $data['show_on_front'] ) && empty( 'page_on_front' );
to
$does_not_have_data = empty( $data['show_on_front'] ) && empty( $data['page_on_front'] );
Since the site crashes with a 500 and becomes unreachable, it seems that users will need to be able to edit the source or use some external tool to rollback/upgrade the plugin to the new version.