Open File Explorer
Go to Documents
Open Electronic Arts
Open The Sims 4
Open Mods
Look for your CC files there
If your CC is in a ZIP or RAR file, extract it first
If you use a custom folder setup, check the folder where you saved your CC
On Mac, open Finder
Go to Documents
Open Electronic Arts
Open The Sims 4
Open Mods
Look for your CC files there