After enabling WP_DEBUG I get following messages:
[15-Mar-2018 14:40:05 UTC] PHP Notice: Undefined index: download_id in /home/***/html/wp/wp-content/plugins/email-before-download/includes/class-email-before-download-shortcode.php on line 43
[15-Mar-2018 14:40:05 UTC] PHP Fatal error: Call to a member function getAttribute() on null in /home/***/html/wp/wp-content/plugins/email-before-download/includes/class-email-before-download-form.php on line 37
Unfortunately it isn’t possible to update PHP on the server (still 5.6.33).
Can you fix this problem to support the PHP version in the next EBD update? 🙂