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I have the same problem when starting Imperator Rome and vic3 but the launcher works for Cities skylines. I have added the paradox launcher to Windows Defender exempion list so that´s not the problem. Please help me!
You must have run the launcher from the desktop shortcut or Paradox launcher.exe, which is a standalone mode for users who do not want to run Steam. It does need a separate game installation if used that way, but this game was never ported to that platform.
You'll need to run it from the PLAY button in your Steam Library instead.