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I also had this problem, but I figured out what was wrong 🙂
if you are using a macbook (in my case the macbook 12" from 2015) it doesn't show you that's it's a .rar or .7zip when you download it. For me it had .package behind the zipped files, so I simply put them in my folder. It couldn't identify the zipped files, and that was my problem.
What I did was I downloaded The Unarchiver (here's a link for it in the App Store: https://itunes.apple.com/us/app/the-unarchiver/id425424353?mt=12 )
Once you have it downloaded, go back into your mods folder and sort it by type. The app should show you all of the zipped files and then you simply unzip them by pressing two fingers on the mousepad (right clicking) and press Open With: the unarchiver.
Hope this helps 🙂
This is the PC-forum, I think your tip might work better on the Mac forum, but they also have really good instructions on how to install cc over there 🙂
https://answers.ea.com/t5/The-Sims-Mac/bd-p/The-Sims-Mac