Display post meta conditionally based on it’s value

If it’s created with ACF, then the way to call the field is like this:

$can_download = get_field('enable_downloads',$postid);

so your code should look like:

<?php 
        global $wp_query;
        $postid = $wp_query->post->ID;                  
        $can_download = get_field('enable_downloads',$postid);
        if ($can_download == 'yes') { ?>

    <?php } elseif ($can_download == 'no') { ?>

    <?php } elseif ($can_download == 'other') { ?>

    <?php } else { ?>

    <?php } ?>