Just as an FYI, I was able to install Super Orders 2.0 and though I had some issues, most were searchable on this thread, EXCEPT:

>>OPTIONAL FILE EDITS
------------------------
After testing the Super Orders system, you can do the following to integrate Super Orders more fully...

1. Edit the "Customers" Admin Box super_orders.php does everything orders.php can do and more, so you really don't need the original "orders" in the admin box anymore. I don't recommend removing it entirely in case something does go wrong in the future, plus a Zen Cart upgrade will just put it back in there.

Open admin/includes/boxes/customers_dhtml.php and comment out the line for orders.php by adding two slashes "//" at the beginning. It should look like this:

$za_contents[] = array('text' => BOX_CUSTOMERS_ORDERS, 'link' => zen_href_link(FILENAME_ORDERS, '', 'NONSSL'));

Now you'll just see the "Super Orders" nav link in the dropdown menu.<<

When I commented out this line, my Admin > Customers disappeared ? When I restored it, it returned to functional again ? Just noting in case someone has the same issue on this, like I did ?? I was unable to find resolution for this by searching.