To upgrade from 2.3.1, follow these steps. 1) Make a backup of your database. 2) Upload the install folder from this package to your current YALD directory on your server. 3) Launch install/upgrade.php from your web browser (For example, http://example.com/yald/install/upgrade.php) 4) CAREFULLY follow the instructions given by the upgrader to successfully complete the upgrade. For help upgrading, visit the website @ http://yald.sourceforge.net.