I've been on 2019.4 and using standard and it seems to work just fine, just setting project up for URP on 2019.4 to see the results.

76% of original size (was 663x19) - Click to enlarge

So this doesn't support Unity 2020.x

Is there a tutorial or guide somewhere for doing it manually? The video I did find glosses over it because it teaches how to use this plugin.

Again all textures are black when importing into HDRP project.. This tool does not work properly. Latest CC, Unity 2019.3, Autosetup 1.1 installed to new unity project.
It keeps setting RGB of Base Map of Surface inputs to {0,0,0} (black). Can be manually fixed by setting it to {255,255,255} white.
I plan to automate the fix using https://forum.unity.com/threads/how-to-access-lit-shader-properties-through-code.625291/ ..

On a brand new Unity 2019.3.15f1 with URP, during impor of a CC3 v3.32 character (NOT CC3+) I'm get a warning "Please update to the appropiate version. Auto Setup does not supported your CC or iClone version. The program will continue to work and may cause problems"
76% of original size (was 663x19) - Click to enlarge

The character is imported but all the materials have no texture applied to them.
76% of original size (was 663x19) - Click to enlarge
Is this a known issue?

Hello, may I know which Auto Setup version you are using? Auto Setup v1.1?
https://www.reallusion.com/character-creator/unreal-engine-auto-setup.html

I've been struggling with the issue of characters importing into Unity with a faceted (unsmoothed) appearance since early September.

Using Unity 2019.3.13 and the latest Auto Setup v 1.1. Models exported from CC v3.32

This only affects CC3 and CC3+ characters that have been converted to Game Ready meshes. The issue is slightly visible in Character Creator itself (if you really zoom in close) but it becomes hugely problematic after import into Unity.
I've tried tweaking smoothing angle in Unity import settings but this makes no difference. I'm fairly new to CC, so don't have very much experience from previous versions, but I never came across this problem before the big update to CC3.3 (when meshes were updted to CC3Base+ so my gut instinct is that the issue lies with this update.

Opened in Blender, the exported FBX appears smooth, not faceted.

Now, here's the update and the reason for this post... I'd always thought that the Unity rendering pipelines only affected lighting and materials, it appears that the rendering of skinned meshes is also being affected. The problem I have with these faceted (unsmoothed) character bodies is only apparent in URP and the Legacy RP. In HDRP the model appears as it should (all be it with slightly wet looking skin, but that's fixable). I've tested both 7.4.3 and the verified 7.3.1 HDRP.

URP, badly affected:
76% of original size (was 663x19) - Click to enlarge

Legacy SRP, slightly affected:
76% of original size (was 663x19) - Click to enlarge

HDRP, all good:
76% of original size (was 663x19) - Click to enlarge

Problem is, I work in VR (for mobile platforms like the Quest) and HDRP is just a no-go for me...

Oddly, I've found that any character created using Headshot is not at all affected. Even after converting to Game Ready, they appear smooth on import into Unity, whatever the rendering pipeline.

This is URP:
76% of original size (was 663x19) - Click to enlarge

So... I'm posting here partly to share my findings, in case someone else is having similar issues and just thinks they're going mad.
Also I've had not the greatest support from 'Support' so I'm hoping the community might have some ideas, or have perhaps already solved the problem.
They've had some useful suggestions (like opening the FBX in Blender and trying HDRP) but a lot of the time I feel like I've been given the run around and not actually been offered any solutions. For the price of the software I really expected Pro support. I can't believe that I've had to do all of this debugging myself, rather than having an engineer from Reallusion assigned to the issue. It makes the characters unusable for me and has stopped me from being able to work on character design for a month. On top of that, the post I was asked to add to the "Feedback" Tracker has had zero response from an employee. I'm nore than a little bit annoyed.
Anyway, rant over. Hopefully some of this is useful to someone. 

                                    

Unity Virtual Reality Developer

With a huge debt of gratitude to Ryan Hayle for helping me debug this off the forums. He correctly identified that my problem isn't with geometry at all but with textures. He suggested that maybe the textures are being stretched and becoming pixelated over the nose and around the eyes due to the resolution. Turns out he was on the right tracks although the issue is not in the Diffuse, or even one of resolution but instead it is the poor quality of the normal map that's generated when you choose to combine GameBase UVs to a single material when converting to Game Base (in CC3).

It's not just that the image is smaller (I'm choosing the Max Texture Size of 4096 during the conversion, so packing the entire body into a 4K map instead of each body part taking up 2K) but the quality of the normal texture generated during the atlasing process is a blocky mess. 
Here's the normal map if you pick 'Multi-material' on converting to Game Base:
76% of original size (was 663x19) - Click to enlarge
And here's the same area when packed to a single material:
76% of original size (was 663x19) - Click to enlarge
It's not just that it's smaller (click the image to enlarge it to 100% of its size). The areas around the nose and eyes have noticeable blocks that create the faceted look I've been seeing. The reduction is only to about 71% of the original map's size but the resizing algorithm is creating these artefacts.
I'll be logging that as a bug.

** EDIT. I've been thinking about this some more and I wonder if the issue isn't that CC3 is using a poor resizing algorithm. Instead, it may be that it's regenerating the normal map from the low poly version of the mesh. I say this because the diffuse isn't being affected. If it is the case, then this is just so obviously wrong (for anyone familiar with high to low poly workflows). You should be keeping your high poly normals and applying them to the low poly mesh.... 

                                    

Unity Virtual Reality Developer

i can see seams and clothing disappears from character in hdrp mode

Honestly the least you can expect from such an expensive software is a functioning unity hdrp export. Im really starting to regret my buy, i bought cc3 originally to quickly create characters and rig clothing, while now spending more time to work things out and waiting for the update of the script. Im really disappointed.

@jankomir.22 just to say I'm in much the same place. I keep hitting such major bugs that make the whole software suite almost unusable to me. Let's hope someone from Reallusion actually hangs out here and cares enough about their customers to actually do something about it.

                                    

Unity Virtual Reality Developer