Apologies, I just did an install of the latest version of 2019.1 but was on an older version before: 0f2. I'll check the HDRP version itself shortly, and also will be trying another import with 2019.1.14f1.

I just checked in Unity package manager and my HDRP version is 5.7.2. I'll be upgrading to 5.16.1 soon!

Thanks for the response.
I've edited my latest message about the mesh quality (cloth) I'm getting in Unity. Can you help me with that?

Happy to give it a try, others on here have certainly helped me! Let me see if I can find your edited post...

So what version of Unity and which script are you using? Is it possible to get to one of the 2019.1 subversions of Unity, and corresponding autosetup script? I have found the best results with this combination so far!

The example is from 2019.1.0f2 & AutoSetup 1.01 for Unity 2019.1 (HDRP.unitypackage)
The HDRP is 5.13.0 I've updated from 5.7.2 (I think) because I've the same result

Hmm, that's the same Unity version as I had! Can you provide more details on how the character looks in Unity? In particular, which materials don't look right to you? Did you try turning off the auto setup script and tweaking the rendering settings for the suspect materials in Unity?

I fixed the materials thing loading them after the import. Now my issue is with the character quality. Cloath looks very low quality compared to how it looks in CC3.
I exported this character as is, no poligons reduction at all
Here is a comparision between Unity and CC376% of original size (was 661x19) - Click to enlarge

@interloko: is there a texture size setting when export/import?

I believe textures are combined, which may reduce their original size. Also, is there a smoothing option for the mesh?

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76% of original size (was 661x19) - Click to enlarge

I got it!
First I found that in my case the importer doesn't apply the textures. Now I find that doesn't apply the smoothing angle.
Now I must find out if the invisible body is another not well applied setting in my end76% of original size (was 661x19) - Click to enlarge