Display EDD Ticket downloads only on specific page(s). Modified from @sumobi

gistfile1.php

<?php

function sumobi_edd_downloads_query( $query, $atts ) {
	global $wp_query;

	if ( 'insert_page_slug_here' === $wp_query->query_vars['pagename'] ) {
		$query['meta_key'] = '_tribe_eddticket_for_event';
	}
		return $query;
}

add_filter( 'edd_downloads_query', 'sumobi_edd_downloads_query', 10, 2 );