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...
I downloaded MCCC and it seems to show up fine, the options are all there but when I try to set the household limit of sims to something other than