• We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
What platform is this on - Steam, Epic, somewhere else?

Does it show in te DLC tab of our launcher as enabled?
 
According to this thread
this was caused by an AV app, I've asked that poster which one.

Meanwhile, which AV app do you use? Add these files to all its exceptions lists:

Victoria3.exe (in the Steam Vic3-binaries folder)
dowser.exe (in the Steam Vic3-launcher folder)
C:/users/{UserName}/AppData/Local/Programs/Paradox Interactive/launcher-v2.2023.11/paradox launcher.exe
C:/users/{UserName}/AppData/Local/Programs/Paradox Interactive/bootstrapper-v2.exe