If you bought Clothes Converter from DAZ, you should have had two e-mails:  the usual DAZ Order Confirmation and one headed "DAZ Serial Number Information", containing the key and the "name" (I missed the username at first, so I was a bit stumped for a moment when the installation rejected mine).   The installation was fine, when I entered the details from the e-mail.   If you didn't get that e-mail, I suspect that that would be the fault of DAZ.

I think Clothes Converter complements Wardrobe Wizard.   Not everything I try in WW works out, but there are aspects of it which make it more versatile than CC.      Even so, I have just happily used CC to convert clothing from V3 to V4 and it seems to have done the job well and quickly.   I do agree with the comments above in praise of PhilC's customer support, which is the benchmark.