First of all to download the files just click on Code (watch example). You'll have 2 options download a zipper or use GitHub Desktop (if you want to keep the folder updated: link).
If you downloaded the zipper, just extract the files in a folder, otherwise:
(Important) After that you have to add the created folder as Daz library, like this.
I noticed that loading a set of my clothes (g3) may give problems , as in this case:
To fix this you will have to add the dress (g3):
The dress will have the default textures. To get the textures modified by me. Just follow these steps:
Click on the dress in my set (the one with problems). Copy the textures:
Click on the new dress (the one you just added). And paste the textures:
After that delete the dress with problems. And as you can see in the example, the dress will not have the previous problems: