When you are installing the extension, you go to admin >> extensions >> installer and click upload button and select the extension ocmod.zip file but you got following error like “The directory catalog/controller/product is not allowed to be written to – Opencart error”. The way to solve it is to add the path at admin\controller\marketplace\install.php
Here in the example the path is catalog/controller/product so we needed to add at
// A list of allowed directories to be written to
$allowed = array(
Whatever error path you get you need to add here to install successfully.