Here's what I do.

I create a folder on my D:/ drive and call it 1 I then create a second folder inside that folder and call it Content

So D:/1/Content that's the folder structure. Now unzip your zip files to D;/1/

Open DazStudio Under Edit/Preferences There is a content Tab, click the button and navigate to your new D:/1/Content

Everything in that folder is now available for use in DazStudio using the Content Library