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That is usually an antivirus app getting in the way , or a file permissions issue. What antivirus app do you use? You need to make sure all these apps are in its exceptions lists:

eu4.exe and dowser.exe (in the Steam EU4 folder)
C:/users/<UserName>/AppData/Local/Programs/Paradox Interactive/launcher-v2.2021.9/paradox launcher.exe
C:/users/<UserName>/AppData/Local/Programs/Paradox Interactive/bootstrapper-v2.exe

IF that does not help, also set all those .exe files (EXCEPT eu4.exe!) to run as the Windows Admin user.
 
I don't have a antivirus app, when i put those files as windows admin it caused more problems. A troubleshoot window will pop up when i try and opening the launcher, it says
"Paradox launcher was found but it's not working. would you like to reinstall?"

When I click okay it just brings me to another tab.

.
1637816692410.png
 
I don't have a antivirus app
In that case Windows defender is active. Please add those items I listed to its Ransomware-Apps Allowed Through list.


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

Launcher-2021-11-24.log has nothing in the Logs
 

Attachments

  • cpatch.log
    327,5 KB · Views: 0
  • launcher-bootstrapper.log
    54,7 KB · Views: 0
  • launcher-dowser.log
    8,5 KB · Views: 0
I see some permissions errors in there. 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/<UserName>/AppData/Local/Programs/Paradox Interactive/
- C:/users/<UserName>/AppData/Local/Paradox Interactive/
- C:/users/<UserName>/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/<UserName>/AppData/Local/Paradox Interactive/launcher-v2/
Please attach them here.
 
The same "bootstrapper requires elevation" message as in your post #3 above, are you saying? Because the matching message in the log files is gone now, as it should be.
 
Let's try forcing an update of the launcher.

Download the installer package: https://forumcontent.paradoxplaza.com/emailsignatures/2021.8-win-prod.zip

Unpack the file you just downloaded and place the three files in the Steam folder for the game you're having issues with. If asked if you want to replace already existing files click "yes" - that's a sign you are in the right place!

Then please repeat the launcher reinstall procedure from before.

Good luck with that!
 
Can I get the new launcher logs please.