That's what one would like to think, but Template monster may have forcibly removed the code for the additional images. They have a tendency to do such things. Do none of them show up?
Does your includes/templates/YOUR_TEMPLATE/templates/tpl_product_info_display.php have this section of code?
Code:
<!--bof Additional Product Images -->
<?php
/**
* display the products additional images
*/
require($template->get_template_dir('/tpl_modules_additional_images.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_additional_images.php'); ?>
<!--eof Additional Product Images -->
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