1. В контроллере /controllers/front/ProductController.php
Добавьте
$manufacturer = new Manufacturer((int)$this->product->id_manufacturer, $this->context->language->id);
$this->context->smarty->assign(array(....
ниже замените
'product_manufacturer' => new Manufacturer((int)$this->product->id_manufacturer, $this->context->language->id),
на
'product_manufacturer' => $manufacturer,
'adresses_manufacturer' => $manufacturer->getAddresses($this->context->language->id),
2. В шаблоне /themes/default-bootstrap/product.tpl добавьте вывод адреса
<p>
{foreach from=$adresses_manufacturer item=adresse}
Company - {$adresse.company}<br>
Address - {$adresse.address1}<br>
Postcode - {$adresse.postcode}<br>
City - {$adresse.city}<br>
Phone - {$adresse.phone}<br>
Phone_mobile - {$adresse.phone_mobile}<br>
Country - {$adresse.country}<br>
State - {$adresse.state}<br>
{/foreach}
</p>