I did not find how to get the OB Package Browser.

My Browser displays categories, but not packages.

in the top right menu of the Browser, item "Choose new default browser"�
I have only two choices :

Browser
OBSystemBrowserAdaptor

In the book�PBE1-2009-10-28.pdf "Pharo by Example " �it is showned a OB Package Browser ... But how can I get it ?�
(I did read FAQ 5, p. 318.).