Download the mod or CC files from a trusted source
If the file is zipped, extract it
Open your Documents folder
Go to Electronic Arts
Open The Sims 4
Open the Mods folder
Copy the mod files into the Mods folder
Keep script mods no more than one folder deep
Make sure files end in .package, .ts4script, or other supported mod formats
Launch The Sims 4
Open Game Options
Go to Other
Enable Custom Content and Mods
Enable Script Mods Allowed
Restart the game
Check the Mods list at startup to confirm the mod is installed
Update mods after game patches
Remove broken mods if the game has issues