Much thanks. If anyone is getting the Unhandled Exception error, try this: I had the same issue, but I was using the extracted content rather than the extracted save because that's the way it's usually done with save editors. Use the actual extracted file instead of the content and see fi that fixes it for you. It certainly did for me.
Loving the editor I did have trouble at first with it, but now it's working ^_^ Thank you so much for such an editor