ption 2: Manually copy the files:
The files are located in the Manual_Install folder
Copy the files and folder to your Maya user directory, and make sure to preserve the icons/scripts/shelves folder structure.
(Windows) C:Documents and Settings$userMy Documentsmaya2013
(Mac OSX) /Users/$user/Library/Preferences/Autodesk/maya/2013/
(Linux) /home/$user/maya/2013/
Mac OSX note:
The "Library" folder is hidden on Mac,
To get to it Option-click the Go Menu in the Finder and choose Library
After installation, start Maya, and you will find a new Shelf called 'advancedSkeleton`