This is the FAQ for what haredo is talking about: https://www.zen-cart.com/tutorials/index.php?article=33
Also, you've failed to upgrade the /includes/filenames.php file properly. I can tell because when you go to your admin URL it's redirecting you to: http://www. bonters.com/admin/FILENAME_ALERT_PAGE.php instead of to the proper page name which would be defined if your /includes/filenames.php file was up to date.
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