update hikashop after falang

-- url of the page with the problem -- : www.tuttobrasileiro.com
-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.4
-- Error-message(debug-mod must be tuned on) -- : no error

Hi,
I am trying to use Falang with HIkashop.
The site is updated with the last version of joomla and hikashop.
Know I want to use Falang for multilanguage. So I installed it and it seems working fine with menus and articles of joomla,

Know as from documentation on hikashop site, to make falang working with products and categories and more of hikashop I should install again hikashop as an update.

But how to di that?
If I go to Hikashop\documentation\install-update I found "you already have the latest version of hikashop starter" and there is no "update" button.
Should I completely reinstall hikashop from joomla extension manager?
Or install through ftp and overwrite all hikashop files?

Regards
Marco