Upgrade your AbanteCart eCommerce application core version once in a while, since important fixes or new features will be released.
You will see an update notification once you log in to the admin. It will show in your message box.
Follow the link
In notification message click on upgrade link.
You can also use key abantecart_upgrade_123 (abantecart_upgrade_version) to submit to extension install section.
Fix file permissions
If you have files or directories that do not have write permissions, you will be asked to do upgrade using FTP. You can change permissions on required files to be writable (777) or just make all files and directories writable for the upgrade process. This can be and recommended changed back after an upgrade. If you encounter issues or do not feel comfortable with permissions, run a manual upgrade instead.