This is a bit of an internals question, but modders and even people who play the game enough to know how it ticks would have insight, I'm mostly spitballing here so there are no wrong ideas or answers.
Example: Say the user goes to download a sim with a cool haircut that's CC. They download it but they don't have the hair so the sim is bald. Is that the only time that check for hair is asked? Does it really save the bald version or a version that says it has the CC hair on its head? Like does it wait for you to have that hair and keep looking for it silently or does the sim you downloaded just have no hair info now?
I ask because I'd love to have a poke around and make some kind of mod or utility that can checklist the cc items you lack against maybe a local list or a site that at least gives you its name so its searchable and you can download them.
Does anyone offhand know the answer or have any idea of a test to see if that cc name is still present in the game or the data? What would be the best way to feel around for it? If we could get it to spit out the names of the CC a person lacks in each download there might be a chance of making an attempt at some kind of central CC manager.
If you are having problems seeing the CAPTCHA, please clear your browser's cache and cookies and ensure that you do not have any browser addons or extensions that interfere with the display of the CAPTCHA. Then, close the CAPTCHA window and click on the register button to open the CAPTCHA again.