Hi,
Assuming you are familiar with the views and their edition as described in the documentation, you could insert the following code where you see fit. It worked for me.
Note that the "if" condition is still in, so the display should depend you setting the respective switch in the configuration right.
<?php
if($this->config->get('manufacturer_display', 0) && !empty($this->element->product_manufacturer_id)){
$class = hikashop_get('class.category');
$manufacturer = $class->get($this->element->product_manufacturer_id, true);
global $Itemid;
$categoryClass = hikashop_get('class.category');
$categoryClass->addAlias($manufacturer);
echo $this->image->display($manufacturer->file_path,false,$manufacturer->file_name, '', '', $this->image->main_thumbnail_x, $this->image->main_thumbnail_y);
}
?>