Edit Orders 1.53 install question

[invision]

I'm trying to install the latest version of Edit Orders (1.53) to my install of Zen-cart 1.38a/zenmagick 0.90.

The install (readme.txt) includes instructions on editing 'admin/orders.php'

INSTALLATION:
=============
1. Upload files to your store directory;
2. Make the following changes to admin/orders.php:

Find:

$contents[] = array('align' => 'center', 'text' => '<a href="' . zen_href_link(FILENAME_ORDERS, zen_get_all_get_params(array('oID', 'action')) . 'oID=' . $oInfo->orders_id . '&action=edit', 'NONSSL') . '">' . zen_image_button('button_edit.gif', IMAGE_EDIT) . '</a>');

Replace With:

$contents[] = array('align' => 'center', 'text' => '<a href="' . zen_href_link(FILENAME_ORDER_EDIT, zen_get_all_get_params(array('oID', 'action')) . 'oID=' . $oInfo->orders_id . '&action=edit', 'NONSSL') . '">' . zen_image_button('button_edit.gif', IMAGE_EDIT) . '</a>');

The challenge is, I can't find the lines of code in orders.php to edit. I've gone back to the original install files for 1.3.8 and the code to edit is not in there.

Am I missing something?

Perhaps someone could share line numbers where this code exists?

thanks in advance for your assistance.