AlwaysSkint

I remember that one of the missing $data above is in Customers table.

This seemed to work fine - I can try with a different client database:

//******************************************
//manufacturers_info
//******************************************
      $QmanufacturersInfo = $mysqli->query('select *
                                            from ' . $this->PrefixTable . 'manufacturers_info
                                          ');

      echo '<hr>';
      echo '<div>table_manufacturers_info</div>';
      echo '<div>' . CLICSHOPPING::getDef('text_number_of_item') . ' : ' . $QmanufacturersInfo->num_rows . '</div>';
      echo '<hr>';

      while ($data = $QmanufacturersInfo->fetch_assoc()) {

// to do
        foreach ($clicshopping_languages as $languages) {
          echo $data['manufacturers_id'] . '<br />';

          $sql_data_array = [
            'manufacturers_id' => (int)$data['manufacturers_id'],
            'languages_id' => $languages['languages_id'],
            'manufacturers_url' => $data['manufacturers_url'],
            'url_clicked' => (int)$data['url_clicked'],
            'date_last_click' => $data['date_last_click']
          ];

          $this->db->save('manufacturers_info', $sql_data_array);
        }
//
      }

Why are you running copyAdministrationMenu ?

The Import/Export Menu item isn't getting created in Admin - remind me of the URL to do this, please.

Additionally,  receive one error:

PHP Warning:  file_get_contents(): Filename cannot be empty in /home/clic/public_html/includes/ClicShopping/Apps/Tools/EditLogError/Sites/ClicShoppingAdmin/Pages/Home/templates/edit.php on line 92

Why are you running copyAdministrationMenu ? ==> Because it's inside the BD ot in txt files.
If inside a txt files do not exist it take the default language
Inside the db it look the langaue data else it display nothing. ==> Copy the default language

http://localhost/clicshopping_test/ClicShoppingAdmin/index.php?A&Tools\ImportData  ==> configuration

and install

the link :

http://localhost/clicshopping_test/ClicShoppingAdmin/index.php?A&Tools\ImportData\ImportData ==> to use the app