Thanx for replying.

The path is correct: <store root>/includes/classes/order.php

This file can be found at fec/required_files/includes/classes/order.php after extracting the contents of fast_and_easy_checkout_for_zen_cart_1-8-1.zip file.

However, the message stopped when I set admin -> configuration -> e-mail options -> send low stock emails to 1. I made some purchases and then set it back to 0.

I have made some other purchases with several quantities ... and I have not seen the message yet ...

This sounds good ...

I do not know ... if I see it I will report back.

Kind regards,
orange_juice