We would LOVE to update to its latest version, but we encountered an issue with the activation with its latest version. We’re unable to bypass the security in its latest version, as it’s making a lot of server API calls. We will update the file as soon as possible once we got a solution for this.
Meanwhile, please have a look at this thread which explains the entire process.
I installed version 18.104.22.168 on a new Wordpress and I encountered a fatal error.
I installed version 4.3.6 and it works correctly, premium ok!
I updated version 4.3.6 to version 22.214.171.124 from the Festinger menu and it installed successfully, but the premium is not working. I am attaching two images for comparison, in the latest version the menu looks like the free version.