2_GUIDE MATLAB –HOW TO INSTALL A TOOLBOX
As mentioned in the File Information above, this is for MATLAB 7.1.0, which had the 'old' graphical user interface (GUI), before the ribbon-style GUI was implemented.
In newer versions of MATLAB (R2012b onwards) the same commands are available from the Home menu by clicking the Set Path button on the Environment group.
This is for a toolbox already installed and needs to be added or launched by MATLAB. Installing a new toolbox is a different issue!
would be better in english but it worked like this also :)