The download can be found here:

NOVELL: Downloads - Novell ZENworks Linux Management 7.3 IR1

the readme here:

Novell ZENworks 7.3 Linux Management with Interim Release 1

and here is the what's new:

Novell Doc: Novell ZENworks 7.3 Linux Management Installation Guide - What’s New in ZENworks 7.3 Linux Management with Interim Release 1

Rainer