Hello !
https://soupday.github.io/cc_unity_tools/usage.html
Based on the description in the link, I applied it to my Unity project as it is.However, after importing the cc4 model, if you press 'Import Characters', it says 'No CC/iClon Characters detected!'.

I tried with URP 14 (2023.1.0a4) because I thought it was a version issue, but it's still the same result.
The current version of the Unity project is 2023.2.10f1.
Also, if you right-click the cc4 model, you will see only Reallusion -> LOD Combiner.
Not only does it not make the prefab itself, but it also does not run cc/ic import URP 1.6.1 for this purpose.

I've tried various things about this (version change, character reposition, plug-in reinstallation) but I haven't solved it yet.
Please tell me how to solve it. I'm really desperate. 
Thank You.
.76% of original size (was 662x19) - Click to enlarge

A valid character is a collection of files exported from CC4 to Unity of the form:

• characterName.fbx
• characterName.json

and the textures folders:

• characterName.fbm/
  
• textures/characterName/

I am exporting from cc4 but no json created. Is it because the cc4 is trial? I cant find any anwer on the net.