If you have a complete installation you can enter the Recovery Mode.
The initial installation instructions tells you to remove the install.php, in order to enable Recovery Mode you must first restore this file.
Please note that when you have entered the Recovery Mode, your site is not available for the public.
Cancel and Exit this Installer
You can exit this installer right now by clicking the button below. This will rename your config_temp.php file back to config.php.
You can uninstall and clean your database and start a clean installation again.
Core System Installer
Change Core System configurations
Change Primary Account Details
Change System Super Administrator details without need to recover password or transfer SA account ownership to another person.
Discard current file and replace with a standard version of the .htaccess file