Download link for free products Easy Digital Downloads

Hey guys,

I am looking to assign a direct link for free products in the @Easy Digital Downloads153 plugin but haven't figured out how to go about it. Has anyone done it before? Any suggestions would be appreciated.

Thank you.

<?php 
    if( edd_get_download_price( get_the_ID() ) == 0 ) {
        $download_link = DIRECT_DOWNLOAD_URL;
?>
    <a href="<?php echo $download_link; ?>" class="download-button">Download Now!</a>
<?php } ?>