public static function makeGroupDataItemsDownloadable($html, $args) {
        global $usces;

        if (!WelcartUtils::isOrderCompletionPage()) {
            return $html;
        }

        $sels = unserialize($args['cart_row']['serial']);
        // combo-set ID not set, continue
        if (empty($sels['comboSetId'])) {
            return $html;
        }
        // combo-set group items not set, continue
        if (!isset($sels['comboSetItems'])) {
            return $html;
        }

        $realcart = $_SESSION['usces_cart'];
        $_SESSION['usces_cart'] = $sels['comboSetItems'];
        $gitemscart = $usces->cart->get_cart();
        $_SESSION['usces_cart'] = $realcart;

        $datacart = [];
        foreach ($gitemscart as $i => $data) {
            $usces_item = $usces->get_item($data['post_id']);
            if ($usces_item['item_division'] === 'data') {
                $datacart[] = $data;
            }
        }

        if (!empty($datacart)) {
            $member = $usces->get_member();
            $_SESSION['comboSetIsPurchased'] = $usces->is_purchased_item($member['ID'], $args['cart_row']['post_id']);
            $fd = new FileDownloads();
            add_filter('dlseller_filter_download_para', [$fd, 'filterGroupItemDownloadUrlParams'], 10, 2);
            $html .= '<div class="avc-v3 flex column-nowrap mt-1rem">';
            $html .= dlseller_completion_info($datacart, 'return');
            $html .= '</div>';
            remove_filter('dlseller_filter_download_para', [$fd, 'filterGroupItemDownloadUrlParams'], 10);
            unset($_SESSION['comboSetIsPurchased']);
        }

        return $html;
    }