- Download the 1-Click Upgrade module from PrestaShop Addons: http://addons.prestashop.com/en/administration-tools/5496-autoupgrade.html. Save the Zip file to your desktop.
- In your PrestaShop administration panel, go to the "Modules" page or of the "Modules" menu.
Click on the "Add a module" button, located at the top right of the list of available modules.
If updating from version 1.4, click on the "Add a module from my computer" link, located at the top left.
- In the form that opens, click on the "Browse..." button, then find and select the module's Zip file that you just downloaded.
- Click the "Upload this Module" button. PrestaShop will put the module on your server, unzip it, and place the files in the
This process is explained in details in the "Making and restoring your own backup" chapter of this guide: http://doc.prestashop.com/display/PS15/Making+and+restoring+your+own+backup.