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1. To save your translations, in your current Back Office >> Tools >> Translations, export each language using the built-in Export tool.
2. In your server database admin, back up your database.
3. Via FTP, in the PrestaShop folder on your hosting server (e.g., http://www.mysite.com/prestashop/), create a backup copy of your current PrestaShop folder by renaming it (e.g., http://www.mysite.com/prestashop_old/).
4. Download the latest version of the PrestaShop e-Commerce solution software.
5. Unzip the new PrestaShop ZIP archive anywhere on your hard drive.
6. Upload via FTP the new PrestaShop files located in the unzipped prestashop folder (and not the folder itself) to a new PrestaShop directory (e.g., http://www.mysite.com/prestashop/).
7. If you had previously modified the contents of the /mails folder, copy the contents of your backup copy of /mails to the new build’s /mails folder.
8. Copy the contents of your backup copy of the /img folder to the new build’s /img folder.
9. If you had added any extra modules to your default version of PrestaShop, copy the added modules from the backup copy of /modules to the new build’s /modules folder.
10. If you had installed some modules which keep their configuration inside a file (instead of the database) such as the “editorial” module (which use the editorial.xml file to store your content) you will have to copy them from your backup to your current module folder (e.g., “/modules/editorial/”).
11. If you had previously modified the .htaccess file, merge the contents of the old and new .htaccess files, deleting any duplicate information. Do not replace one with the other.
12. If applicable, copy your customized themes subfolder (e.g., /themes/mythemes) from the backup /themes folder to the new build’s /themes parent folder.
    • Note: If you had made changes to the default theme itself (not recommended; please see Create a customized Theme for the proper procedure), running the updater will therefore erase your changes. To recover the changes you had made to the default theme, create a new customized themes folder (for example, /themes/mythemes) in the new build and then transfer into it the contents of the old default theme folder located in your backup copy of PrestaShop.
13. Copy the settings.inc.php file from the backup folder /config to the new build’s /config folder.
14. In a Web browser, launch the Installer by adding /install to your shop’s URL (e.g., http://www.mysite.com/prestashop/install).

Note: Regularly back up your database, ideally on different computers, in case of problems related to hardware or security.