Thanks for informing that it is not working. Will have to figure out what is causing the issue. Meanwhile, you can try out the web build of this tool. I wasn't able to figure out how to export the output in web builds back then. But it is working now.
Right now the exported output is just a json file containing some list of numbers. It is useful only if you are using Flame engine and want to display an isometric map. But in future I might consider exporting screenshot as well.