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Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-EU4
- manually delete both the Steam/SteamApps/common/Europa Universalis IV AND Documents/Paradox Interactive/Europa Universalis IV folders
- re-install game in Steam, run a Steam Verify when done.
- add EU4.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test

In particular make sure there are no files or folders left under either the Steam EU4 or Documents EU4 locations, before installing again.
 
Ah, yes, Epic.

What we've found to work for most is the following:



Clearing the Epic Games launcher cache

Press Windows Key + R and type in "%localappdata%" to open a File Explorer Window

Look for the Epic Games Launcher folder and delete it

Restart your computer, start the Epic Games launcher and try the game again



Reinstalling the launcher

1. Uninstall the paradox launcher via Add/Remove programs (not EPIC)

2. Restarting your computer

3. Reopen the game so that is forces the latest version of the launcher to install

4. Scroll down the dlc list to the left you should see your installed dlc at the bottom with checkmarks next to them