1: Make new folder "Downloaded Textures from Repository [date]"
2: Place textures from repository here.
3: In Library Manager, add this folder to the Library load.
4: Reload library. NOw you can access the new images.
5: In Archicad>Materials, you can duplicate or alter an existing material by selecting a new image.
6: If you want this texture to carry thru to your LightWorks renderings, "Match Internal Engine" in the LightWorks Material dialog.