Hi,
I needed the similar thing. You only need to modify the $listing_sql at index.php that was modified by this contrib.
Find this
$listing_sql = "select distinct " . $select_column_list . " p.products_image, pd.products_name, p.products_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, IF(s.status, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status, s.specials_new_products_price, p.products_price) as final_price from " . TABLE_PRODUCTS_DESCRIPTION . " pd, " . TABLE_PRODUCTS . " p left join " . TABLE_MANUFACTURERS . " m on p.manufacturers_id = m.manufacturers_id left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id, " . TABLE_PRODUCTS_TO_CATEGORIES . " p2c where p.products_status = '1' and p.products_id = p2c.products_id and pd.products_id = p2c.products_id and pd.language_id = '" . (int)$languages_id . "' and " . $cat_Search . "";
And replace with this
$listing_sql = "select distinct " . $select_column_list . " p.products_image, pd.products_name, p.products_id, p.manufacturers_id, p.products_price, p.products_tax_class_id, IF(s.status, s.specials_new_products_price, NULL) as specials_new_products_price, IF(s.status, s.specials_new_products_price, p.products_price) as final_price, cat.categories_id as catid, cat.categories_image, catd.categories_id as catd_id , catd.categories_name from " . TABLE_PRODUCTS_DESCRIPTION . " pd, " . TABLE_PRODUCTS . " p, " . TABLE_CATEGORIES . " cat, " . TABLE_CATEGORIES_DESCRIPTION . " catd left join " . TABLE_MANUFACTURERS . " m on p.manufacturers_id = m.manufacturers_id left join " . TABLE_SPECIALS . " s on p.products_id = s.products_id, " . TABLE_PRODUCTS_TO_CATEGORIES . " p2c where p.products_status = '1' and p.products_id = p2c.products_id and pd.products_id = p2c.products_id and pd.language_id = '" . (int)$languages_id . "' and " . $cat_Search . " and cat.categories_id = p2c.categories_id and catd.categories_id = p2c.categories_id and catd.language_id = '" . (int)$languages_id . "' ";
This will add the categorie name and image. You can remove the other id's since i only used them for checking.