over 2 years ago - AndrewT - Direct link
Please try this:

- uninstall Paradox Launcher v2 from the Windows "Apps and features" utility, if still present.

Delete the following folders if still present:

- C:/users//AppData/Local/Programs/Paradox Interactive/
- C:/users//AppData/Local/Paradox Interactive/
- C:/users//AppData/Roaming/Paradox Interactive/launcher-v2/
To see the AppData folder you'll need to enable View Hidden Items in File Explorer.

- exit the Steam app entirely
- run steam.exe as the Windows Admin user

- run the game from the PLAY button in Steam


IF that doesn't help, in this folder are some .log files:
C:/users//AppData/Local/Paradox Interactive/launcher-v2/
Please attach them here.


Note that you can run ck3.exe directly from File Explorer, which bypasses the launcher.  
over 2 years ago - AndrewT - Direct link
That sounds like the launcher is now working, but you have a problem in the game. Is that right? Do you see launcher 2022.8 now?

What happens if you run ck3.exe directly?