Another thing I found, but I don't know if it applies to all version of Super_Orders, but it is not in 47, 48 or 48a.

There must not be a lot of people using Super_orders that have download files.

In the /admin/includes/languages/english/super_orders.php I had to add these 2 lines
Code:
define('TEXT_INFO_EXPIRED_DATE', 'Expired Date:<br />');
define('TEXT_INFO_EXPIRED_COUNT', 'Expired Count:<br />');