function event_tickets_plus_init() {

	if ( class_exists( 'Tribe__Main' ) && ! is_admin() && ! class_exists( 'Tribe__Tickets_Plus__PUE__Helper' ) ) {
		tribe_main_pue_helper();
	}

	new Tribe__Tickets_Plus__PUE( __FILE__ );

	$classes_exist  = class_exists( 'Tribe__Tickets__Main' ) && class_exists( 'Tribe__Tickets_Plus__Main' );
	$plugin_can_run = $classes_exist && tribe_check_plugin( 'Tribe__Tickets_Plus__Main' );

	/**
	 * Filter whether the plugin can run.
	 *
	 * @since 4.10
	 *
	 * @param boolean $plugin_can_run Whether the plugin can run.
	 */
	$plugin_can_run = apply_filters( 'tribe_event_tickets_plus_can_run', $plugin_can_run );

	if ( $plugin_can_run ) {
		tribe( 'tickets-plus.main' )->instance();

		return;
	}

	// if we have the plugin register the dependency check will handle the messages
	if ( class_exists( 'Tribe__Abstract_Plugin_Register' ) ) {
		new Tribe__Tickets_Plus__PUE( __FILE__ );

		return;
	}

	add_action( 'admin_notices', 'event_tickets_plus_show_fail_message' );
	add_action( 'network_admin_notices', 'event_tickets_plus_show_fail_message' );
}