How are you trying to install it? I install the lot itself with Clean Installer into the default folder. Then for all the cc that I want, I make another folder inside my download folder and send the cc there.

There is also the 'Larger Households' hack by 5th LMNt on MTS. I use that one as you can add up to 50 sims. Not that I would have a family of 50 sims  But I have had households of 14.