I know that this old module is no longer being developed, but I need it for Zen Cart 1.3.7. Has anyone got it working for the latest release?

Apparently, there are some files that have been removed in the most recent releases that are still included in the file confirm_track_sub.php:
require('../includes/classes/email.php');
require('../includes/classes/mime.php');

These files are no longer in Zen Cart. Does anyone know how to make this work with 1.3.7? Please help - this is causing problems so that I cannot offer my suppliers to click a link in the email in order to enter the tracking information themselves. This will require me to take an extra step to get the tracking info from them and add it myself.

Thank you!