Thanks for contacting us here about this extension. Iitem rating 1.2.4 is our lastest version. It could be a bug when using Joomla 3.8.1. In order to have a deeper look at your problem, please drop us a ticket (menu Support > Ticket support). The developer in charge will take a look at that.
We have detected that you came here from a website that distribute non official sources of our extensions. As we care about all our users, including hackers :) we want to warn you before you do something you will regret.
Is it worth it using nulled extensions? Well we don't think so, it’s a real problem for many reasons: