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

Two typos is that osCmax20.php

Missing $data for two fields.

Finally got it to install..

install/includes/application.php

define('DEFAULT_LANGUAGE','en');
  use ClicShopping\OM\CLICSHOPPING;
  use ClicShopping\OM\HTML;

install_4.php

//  use ClicShopping\OM\Language;

..

//  $CLICSHOPPING_Language = new Language();
//  Registry::set('Language', $CLICSHOPPING_Language);

That bloody .htaccess!!!

Removed the first three lines from ClicShoppingAdmin .htaccess

Error Log:

PHP Warning:  file_put_contents(/home/clic/public_html/includes/ClicShopping/Sites/ClicShoppingAdmin/site_conf.php): failed to open stream: Permission denied in /home/clic/public_html/install/templates/pages/install_4.php on line 253

It looks as though some code is changing this to 444 too soon. I began with 644, so I know it has been changed during the install process.

Hope this helps you to narrow down the installation problems.

Please, please, please remove or comment out those offending lines..

#Options -Indexes
#Options +FollowSymlinks
#Options -MultiViews

[16-Nov-2020 23:57:02 UTC] PHP Warning:  Use of undefined constant DEFAULT_LANGUAGE - assumed 'DEFAULT_LANGUAGE' (this will throw an Error in a future version of PHP) in /home/clic/public_html/includes/ClicShopping/OM/Language.php on line 85
[16-Nov-2020 23:57:02 UTC] PHP Notice:  ClicShopping\OM\Language::set() - The language does not exist: DEFAULT_LANGUAGE in /home/clic/public_html/includes/ClicShopping/OM/Language.php on line 114
[16-Nov-2020 23:57:02 UTC] PHP Fatal error:  Uncaught Error: Typed property ClicShopping\OM\Language::$language must not be accessed before initialization in /home/clic/public_html/includes/ClicShopping/OM/Language.php:120
Stack trace:
#0 /home/clic/public_html/includes/ClicShopping/OM/Language.php(99): ClicShopping\OM\Language->getCode()
#1 /home/clic/public_html/includes/ClicShopping/OM/Language.php(93): ClicShopping\OM\Language->getLocale()
#2 /home/clic/public_html/install/templates/pages/install_4.php(38): ClicShopping\OM\Language->__construct()
#3 /home/clic/public_html/install/templates/main_page.php(60): require_once('/home/clic/publ...')
#4 /home/clic/public_html/install/install.php(33): require_once('/home/clic/publ...')
#5 {main}
  thrown in /home/clic/public_html/includes/ClicShopping/OM/Language.php on line 120

Added php handler to top of .htaccess and step 4 loaded the above gre module but still stopped with 500 error.

Started from a fresh copy of master.zip

Commented out your bad .htacess settings: top 3 lines.

Step 4 of installation getting blocked again with a 500 error.

Console debug appears to stop at resource://gre/modules/ExtensionContent.jsm - doesn't load.

Frustrating! Still trying to analyse.

Thanks. I have been working on the server and tuning mariadb, which should help went it comes to migrating bigger databases.

I'll try to test this soon.

Regards,

EJ