EDD Related Items using YARPP (Yet Another Related Posts Plugin)

My sub-theme of twentytwelve has a function.php file that has the following in it:

<?php
function pw_edd_add_author_support($supports) {
	$supports[] = 'yarpp_support';
	return $supports;
}
add_filter('edd_download_supports', 'pw_edd_add_author_support');

I also tried to replace the two placed “author_support” appears with “yarpp_support” and that did not work either.

Thanks for having a look.

I tried this:

<?php
function pw_edd_add_yarpp($supports) {
	$supports[] = 'yarpp';
	return $supports;
}
add_filter('edd_download_supports', 'pw_edd_add_yarpp');

And there is no change.

According to the thread at http://wordpress.org/support/topic/plugin-yet-another-related-posts-plugin-custom-post-type-support?replies=23 I should be able to do this, (since version 3.5). But it looks like I also need to set ‘yarpp_support’ => true

I think the necessary php knowledge to re-wire YARPP to work with EDDs custom content types is a bit out of my reach.