Since the instructions for network licensing using a winzip.wzmul file on the Winzip website didn't work for me, I instead put the license file in the all users\application data\winzip using a transform and changed the value of the ADD_WZMUL property from 0 to 1.
Another property worth changing is RUNWINZIP which is set to 1 by default but by setting it to 0, you can prevent Winzip from opening up upon completion of the installation.
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