If you install this piece of software, you could notice that LayoutTools 2011 (formerly LevelTools) Documentation won't work. To fix the problem we have to open LT_generalProc.mel, search for global proc LT_help() and replace this string
"/maya/2011/LT_docs/LayoutTools.htm"
"/maya/2011.5/LT_docs/LayoutTools.htm"
Best regards.