The reason why they do not work on the CX and Ndless 3.1 is because those programs were made for Ndless 1.0 and 2.1, so the authors will need to edit them or recompile them manually for Ndless 3.1 compatibility.
Also I don't think Nleash is currently useful at all for Ndless 3.1, because OS 3.1 is the latest OS by TI, meaning you have no more need to downgrade. That's unless in the future you absolutely wanted to go back to OS 1.7 or something, but aside from its smaller file size, I think it's useless.
All of those programs were compiled for Ndless 2.1 back in 2010, so it's inevitable they won't work with Ndless 3.1 until the authors update them.