I don't use OS X, but I do use UNIX, and OS X is UNIX under the pretty desktop.  To deal with this in UNIX, create a folder someplace easy to find, drag the downloaded zip there, and open a terminal window in that folder:

1. In the Finder, from the Go menu, choose Utilities.
2. In the Utilities window, double-click Terminal.

Then enter this command (you should be able to copy and paste it in)...

unzip LienV42_Morph.zip

Hit Return, and it will extract extract the zip to the folder.

For more information on the unzip command than you'll likely ever need to know...

http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man1/unzip.1.html

 

EDIT it just ocurred to me; Phil Cooke has an unzip Python script that works within Poser...

http://www.philc.net/unzip.php

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