They not update or not follow the prestashop new version so for 1.7.7. it not works and made very important bugs when you update prestashop new version. You lost finally money because they not update, fixed bugs and not update the module since 2017 if you want lost easily money buy it ... but be sure they not made support or update module ....
Author response
PrestaShop frequently changes lots of things. It is their fault they work on one version not work on another version. We are working on 1.7.7 compatible. If you all do not update the support plane how the developer will manage costing for update. Where PrestaShop addons market place user have to pay more than our module price and got 3 month support. And for major release they have to pay.
Thank you