Getting download link from EDD store using URL variable

functions.php

<?php 
function add_query_vars_filter( $vars ){
  $vars[] = "item";
  return $vars;
}
add_filter( 'query_vars', 'add_query_vars_filter' );
get_query_var('item');

page-template.php

<?php 

//link should be https://site.com?item=slug

if (get_query_var('item')) {    
    $download = edd_get_download($item);
    $download_id = $download->id;
    $files = edd_get_download_files( $download_id );
    foreach( $files as $filekey => $file ) { ?>
        <a class="btn" href="<?php echo $file['file'];?>">Download <?php echo $file['name'];?></a>         
	  <?php }
}