Well... I've read through the whole thread (from the above link) and I saw no reference to any sort of mod that was needed or even mentioned.
It sounded like that character build was intended to function with an "out of the box" installation, but it also sounded as though you may have to do some of the powers and stims etc in a certain order.. though if the order was actually given I'm not sure.
Also of course, be sure to patch the game if you haven't already. Might make a difference, but I never tested it to know for sure.
So unless you can be a bit more specific as to where the mention of this "fix mod" is.. I don't think I can be any more help.