For this purpose we have designed and developed process that allow you to
upgrade AbanteCart right in your admin.
You should have gotten a message in your Admin with the link that you can click to upgrade it.
If you do not have message you can go to "Package Installer" In Extension -> Install Extension.
In the input field copy/paste key abantecart_upgrade_110 and click continue.
Follow the upgrade steps.
Note: If you do not have write permission for some files, you can use FTP credentials as will be prompted or change all permissions on needed files to be writable.
This process backs up your system automatically.
For old fashioned way to upgrade:Download upgrade package from
http://code.google.com/p/abantecart/downloads/listOpen archive and copy content of code directory to your AbanteCart directory.
Run included upgrade.sql file in Mysql
This is all.