Firstly, you need to do is to download the iZip Archiver. This application is free & it is used for unzipping the .rar and .zip folders. Now, download the MCCC mod Open theSims 4 Modssection by following the pathway—Electronic Arts-> The Sims 4-> Mods in Separate Window/Finder Tab...
After a patch, move your Mods folder to the desktop, test the game to make sure it works (on a new save if you want), then download new copies of the mods you use and add them to the new Mods folder in Documents\Electronic Arts\The Sims 4. The download pages should ...