Where can I download ibooks 1.1 for my mac? not my iphone or ipad but rather my desktop

Where is the ibooks 1.1 download link for the Mac? I found the links in itunes for the ipad and iphone but dont see the 1.1 ibooks links for my desktop. Anyone know where I can download this from? I need it to test an ibook that I am writing as the 1.01 version does not allow for testing of keynote presentations made in the latest version of keynote.