wdpv_popular template tag modification

I need to display post excerpt along with the post title when "wdpv_popular" template tag is used. How do I modify the core plugin files? i tired changing the process_popular_code function like this(class_wdpv_codec.php), but its not working:

function process_popular_code ($args) {
		$args = extract(shortcode_atts(array(
			'limit' => 5,
			'network' => false,
		), $args));

		$model = new Wdpv_Model;
		$posts = $network ? $model->get_popular_on_network($limit) : $model->get_popular_on_current_site($limit);

		$ret = '';
		if (is_array($posts)) {
			$ret .= '<div class="wdpv_popular_posts ' . ($network ? 'wdpv_network_popular' : '') . '">';
			foreach ($posts as $post) {
				if ($network) {
					$data = get_blog_post($post['blog_id'], $post['post_id']);
					if (!$data) continue;
				}
				$title = $network ? $data->post_title : $post['post_title'];
				$author = $network ? $data->get_the_author($post['blog_id'], $post['post_id']) : get_the_author($post['ID']);
				$authorurl =$network ? $data->bp_core_get_user_domain( $author): bp_core_get_user_domain( $author);
				$permalink = $network ? get_blog_permalink($post['blog_id'], $post['post_id']) : get_permalink($post['ID']);
				$thumb = $network ? $data->get_the_post_thumbnail($post['blog_id'], 'thumbnail') : get_the_post_thumbnail($post['ID'], 'thumbnail');
				$excp = $network ? $data->get_the_excerpt($post['blog_id']) : get_the_excerpt($post['ID']);

				$ret .= "<div class='work type-work'>" ."<div class='imgwrap'><a href='{$permalink}'>{$thumb}</a><div class='post_meta'><div class='block_comm'><div class='comments'><a>".
					sprintf(__('<span class="wdpv_vote_count">%s votes</span>', 'wdpv'), $post['total']) ."</a></div></div></div></div><div class='fh_cat_content'><a class='fh_feat_tt' href='{$permalink}'>{$title}</a></div><div class='author'>by <a href='{$authorurl}'>{$author}</a></div>{$excp}
			</div>";
			}
			$ret .= '</div>';
		}

		return $ret;
	}

Any help from the developer will be appreciated.