User Guide

The following folders must be copied from your backup to the recently
unzipped /prestashop folder:
 /mails folder has all the mails that you have modified.
If you have never made any modification there, do not worry about
this folder.
 /img folder contains your logo and all the pictures of your store
(categories, products…)
 /modules folder, only copy the modules that you have added.
 /themes/yourtheme folder, only copy your current theme. If you use
the default theme from PrestaShop, do not copy it, you must use
the one from the new version.
 /download and /upload folders, which contain all the downloadable
products, the attached files and the customizable products. If you do
no use any of these functionalities, do not copy these folders.
 /classes folder: in case you have added customized classes to this
folder, copy them to the new /classes folder. Then open each and
every one of them, and rename their class name, adding the "Core"
suffix. For instance, "MyClasse" becomes "MyClasseCore".
Only change the name in the PHP class within file, not the name of
the file itself.