They do have material files this time, but they do not seem to work in Carrara. If import an obj, it imports to the correct location, but cannot find the material file. the obj files are not in the runtime folder, but in a general folder at the same level. Then Carrara starts looking for a file called texturesstonemasonavisctMeatalBeam.jpg where the actual filename in the material file is is texturesstonemasonav1sctMetalBeam.jpg under the runtime folder.

Edit: well that did not work. there is a backslash ( the forum will not display a backslash symbol) between textures and stonemason and stonemason and av1, but the files are under an sct not an av1 subdirectory/

You can hunt the files individually and get them loaded, but it is not seamless.