[2022] I cannot make any mod working.

Please try the following:

- unsubscribe from all mods in BOTH the Steam Workshop and the Paradox mod site mods.paradoxplaza.com
- delete the folder Documents/Paradox Interactive/CK3/mod/
- delete the file Documents/Paradox Interactive/CK3/mods_registry.json (if present)
- delete the file Documents/Paradox Interactive/CK3/launcher-v2.sqlite (if present)
- run the game up and check the launcher is okay with no mod or other errors
- subscribe to a few mods

- run the game up and see if those mods are now available to you.

I hope that does it for you!  

Game logs end up in Documents/Paradox Interactive/CK3/logs/ , if that's what you are referring to. But they show nothing to do with implementing mods.

When you subscribe to a mod on the Steam Workshop, do its files end up in Documents/Paradox Interactive/CK3/mod/ after starting the launcher, or not?

What launcher version do you see? Current is 2022.3  

We use the configured Windows User Documents folder. If you move that folder somewhere else manually, the game and launcher will not know you've done that.

In the left column of File Explorer right click on Documents, just under This PC there. Go to Properties, Location - that is where the game and launcher will look. What does it say there?  

That's because uninstalling a game in Steam only removes files Steam put there. File under the Documents folder that the game or user put there are left alone.