PrestaStats module can be installed in two different ways. It can be either downloaded from PrestaShop Addons Official Marketplace or, on PrestaShop versions 1.5 and PrestaShop 1.6 it is included by default in the list of available modules (Just search for “PrestaStats”).
Here you can find tutorials on how to install and set up the PrestaStats module for both ways.
Install and set up the PrestaStats module from your PrestaShop dashboard, available on PrestaShop versions 1.5+
Install and set up the PrestaStats module from the Sign Up page, or by downloading it from PrestaShop Addons Official Marketplace (for PrestaShop version 1.4)