I just bought the jquery version of the designer but when I open the example/index.html file, it only says
The langJSON needs to be loaded via ajax, this can sometimes be problematic if you are working on a local server?
The same thing is happening to me, when loading the plugin I get the Json file error, I'm using Jquery but I need to run that on a server? Could you give me more details to see if it works from my web server? please.
Please open a support ticket so we can have a closer look at your issue.