[2022] El Dorado DLC did not download

My bet is that you don't actually own the expansion, you own the content pack. There are two El Dorado products:

https://store.steampowered.com/app/338161/Content_Pack__Europa_Universalis_IV_El_Dorado/
]https://store.steampowered.com/app/338160/Expansion__Europa_Universalis_IV_El_Dorado/

In short, you bought the wrong El Dorado .  

If that's not the case though, Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-EU4
- manually delete both the Steam/SteamApps/common/EU4 AND Documents/Paradox Interactive/EU4 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.

Good luck!