[Plugin: Verve Meta Boxes] Retrieving Uploaded Files (XLS)

Hello I am trying to use Verve Meta Boxes to upload an XLS file in the admin and have it link to download from the front end of the site.

This is what I am using, and everything but the file URL (or any isntance of the variable) shows up.

<?php  if((get_post_meta($post->ID, "trade_show_database__spread_sheet", true))) { ?>
		<?php if(get_post_meta($post->ID, "trade_show_database__spread_sheet", true)) {?>
        <?php echo '<p><strong>Trade Show Contacts</strong><br>'; ?>
        <?php $img = get_post_meta($post->ID, "trade_show_database_spread_sheet", true); ?>
        <a href="<?php echo $img['url']; ?>">
        <img src="<?php bloginfo('template_directory'); ?>/images/btn-click-to-download-200.jpg" /></a>
        <?php echo '</p>'; ?>

i am sure there is something I missing, but I can’t seem to place it.
any help?

thanks
Rob

https://www.ads-software.com/extend/plugins/verve-meta-boxes/