Forcing a database update
If you're in a situation where you've already updated EE, but then need to run the database upgrades again, this will help force the installer to run the updates again. This situation may occur if you've upgrade a local or dev version of a site, but need to grab a newer version of the production database to get it up-to-date too.
$config['app_version']to the previous version you've already upgraded from.
define('INSTALL_MODE', TRUE);to your admin.php file, then reload admin.php. Clicking the version number in the footer should show an update is available, even though it may match what says is currently installed. Run the update normally, then remove
define('INSTALL_MODE', TRUE);from your admin.php file.