Hey Hytek3D... move on with your life, as no one, including Jonathan is making you "hanging out there like this" with you Cubex Duo problems=.
First of all I don't believe for one moment that Jonathon, would put several years of his life in to his project KISSlicer, and then abandon the project as leave everybody "hanging out" without any word or public notification that he is ceasing to continue development of KISSlicer.
You might end up feeling and looking like a real piece of ShiT when we may at some date find out :
He was killed or a child of his.
He or one of his family members diagnosed with cancer etc.
He is going through a divorce, no longer has a stable environment.
Or maybe he decided he wanted his life back, and he is just done with it.
etc., etc. and etc.
Be thankful for what we have right now,,, the best free slicer available...
So I say Thank You Jonathan wherever you are....
As for your Cubex, maybe you should have done a little more research and critical thinking before you married yourself to your Cubex Duo.