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Make sure you follow the correct link to ZW3D. There are basically 2 flavors of the download. There is a Full version which you may want to keep as a backup. There is also an update version which can be installed on top of your current SP1. (If you do install the Full version you will be prompted to remove SP1. DO NOT DELETE this from the Program Files directory. Please use the Control Panel > Add / Remove Programs.)
Be sure to also download the "What's New in ZW3D 2011 Service Pack 2?" There is a movie and a Power Point presentation that gives you the highlights of the new version.
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