Thread:Project:Support desk/Open the index.php - How??/reply (2)

When you install an extension, you add it to LocalSettings.php.

However, for some extensions you also have to update the database. This can either be done via the shell (which is recommended) or via the web updater in mw-config/. And in order to run the web updater you will have to open mw-config/index.php with your web browser. As far as I understand, this is the point, which throws the error 403, which it should not do.