backed up the following files before reinstalling:

- /YOUR_ADMIN/includes/modules/category_product_listing.php
- /includes/modules/pages/popup_image/header_php.php
- /includes/modules/pages/popup_image_additional/header_php.php
- /includes/modules/YOUR_TEMPLATE/additional_images.php
- /includes/modules/YOUR_TEMPLATE/main_product_image.php
- /includes/templates/YOUR_TEMPLATE/popup_image_additional/tpl_main_page.php

seems to be working okay, older files are still in place... will find out if the reinstall is missing any customizations in due time (someone else previously had control over the store/files).. thanks