Wordpress - show downloads counter in the homepage for the posts separately

I am using WordPress 4.4.1 with grid system for displaying all the posts in the homepage, I am using Simple download monitor plugin its working fine the inside the posts.Now I want to show downloads counter for each posts in the homepage.

 $db_count = sdm_get_download_count_for_post($id); echo $db_count;

i tried using this to display but the counter shows 0

Please share your ideas where i did worng. Thanks....

via Chebli Mohamed