How To Get Around Carrara 8.5's Invalid Serial Number
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Here is a trick to get around Carrara 8.5 invalid SN, until DAZ fixes the issue. It is a long week-end in the US and many of us have Carrara projects to finish and deliver.
The trick is explained in detail here:
http://www.daz3d.com/forums/viewreply/420308/
HTH.