Did you download a fresh copy of it from your product library? or are you installing with DIM? The serial should be in the zip I think. If installing with DIM then the serial is automatically entered I believe
I did download from the product library, but it was just the program installer not a zip file. The key listed in my list on the Daz site does not work on either the new installation or on the original install. I think it is due to the update to 2.5, which really bites because I actually bought the original as part of the economic stimulus bundle years ago.