Grabbed the last version with DIM, should install fine with Blender 3.2. Don't get why they didn't just share a zip file.
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I never worked with it but material wise, it's rather basic. I guess it's good enough if you're preparing assets for a game engine. Saying that you can already make something way better looking with HDRP or UE5.
If you go for rendering, Diffeo route is just miles better. Diffeo recreate several critical UberShader layers (use BSDF as material method), but don't except 1:1. Outside intrasec quality of maps, Uber skin relies on 3 core concepts, dual lobe, topcoat & translucency/volume, more or less well translated for Cycle (for ex Iray & Cycle don't share the same light absortion formula, while both being legit), so it will need some tuning and being a bit familiar with those layers. Last one being the one that tank any engine (lol), so don't expect huge gain in time rendering at equal quality.