Upgrade from 1.6 to 1.7
Please provide official documentation of upgrade from 1.6 to 1.7. This is not an idea. Its a basic requirement before you dump 1.6 users !!
Hello InDuS, there are several ways to keep your store up-to-date, here is an introduction to all the tools available for now: https://devdocs.prestashop.com/1.7/basics/keeping-up-to-date
But know that starting to migrate from 1.6 to 1.7 is a touchy process, it has to be handled carefully. We strongly advise you to do backup copies before or to get help from an agency.