How to modify defaults_download.php so all listing use paid download

I need to modify this file so that all listings use this method. I know there is an option in settings to set this as the default but this ONLY works if you are submitting listings from the front end and I am not doing this (I am populating them using gravity forms)

this is the code I think I need to modify

// GET DOWNLOAD OPTIONS
$download_ops = get_post_meta($post->ID,’download_ops’,true);
if(!is_array($download_ops)){ $download_ops = array(); }