Is it possible to upgrade from prestashop 1.6.1.9 to 1.7? Where is the official documentation located?
This is not possible at this time. Check out the comments here: http://build.prestashop.com/news/prestashop-1-7-0-0-released/
It will probably be available in the future; at the moment you can only export products, categories and customers from 1.6 to 1.7.x
Update 2017/03/27 : available from today http://build.prestashop.com/news/updated-1-click-upgrade-module/
PrestaShop: https://addons.prestashop.com/en/data-migration-backup/5496-1-click-upgrade.html
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