I did find the answer in more recent thread and this worked for me:
/*
* Events Tickets Plus – WooCommerce Tickets – Prevent Ticket Email from being sent.
* @ Version 4.0
*/
add_action( ‘init’, ‘wootickets_stop_sending_email’ );
function wootickets_stop_sending_email() {
if ( class_exists( ‘Tribe__Tickets_Plus__Commerce__WooCommerce__Main’ ) ) {
$woo = Tribe__Tickets_Plus__Commerce__WooCommerce__Main::get_instance();
remove_filter( ‘woocommerce_email_classes’, array( $woo, ‘add_email_class_to_woocommerce’ ) );
add_action( ‘woocommerce_email_after_order_table’, array( $woo, ‘add_tickets_msg_to_email’ ) );
}
}