Your library directory is where all your folders in that zip go.
Most cases it should be located at
C: /User/Yourusername/Documents/DAZ 3D/Studio/My Library.
If yours is different or you need help feel free to PM me and I’ll help you out copy the folders only and paste them in that directory. Once done open DaZ studio, make sure your on the smart content tab on the left side and click the 3 lines button right above it and choose content database maintenance. Next choose the 3rd and forth box and click ok. Another screen pops up. Choose start I believe it is. Sorry I’m not at home at the moment to give exact names. Once it starts it will take a bit to complete. Once all the windows are gone your items should show up. Sometimes but not often you will have to restart DaZ.
Hope this helps. Let me know if it don’t.