I do have Step 7 v.5.3 and installed just now a FuzzyControl ++ V5. As i know after installation i should have additional FuzzyS7 library accessible in LAD editor, but i dont have. There are just standard libraries installed with Step 7, and nothing more. In \Siemens\S7Libs i do have directory "FuzzyS7" with files inside, but library is not visible in editor...