<?php
if( has_tag() ) { ?>

    <!-- Start of tags -->

        <?php echo get_the_term_list( $post->ID, 'download_tag', 'Tags ', ', ', '' ); ?>

    <!-- End of tags  -->

<?php
}
?>

<?php
    $var = get_the_term_list( $post->ID, 'download_tag', 'Tags ', ', ', '' );
    echo $var;
?>