I solved the problem. In wpc-product.php file located in wp-content/plugins/products / change only one line to be exact line 126 ‘rewrite’ => array (‘slug’ => ‘wpccategories’, ‘with_front’ => false), in place of the ‘slug’ => ‘wpccategories’ insert ‘slug’ => ‘our name’. Then, just reset the permalinks links in the settings and everything whizzes up nicely.