The package method is actually a lot easier and more organized than the sims3pack method. Extract to package, then put it in the Library folder. If you want to uninstall it later, delete the package. I tend to prefer this, as it's basically impossible to unintentionally install CC along with the lot.
So does it replace the CC tied in with the lot with a similar object instead? Similar to when you don't have the store content tied in with custom lots?
Also, what if a family is tied in with the lot? I did have a sims3pack which included a previous family along with their house, and it has been having trouble installing as well. Is it safe to try this method when the sims3pack includes a household?
(Edit: Just gave it a try and noticed that lots with households show up just fine. Some items had CC textures replaced, but I did notice some items such as beds etc were not replaced by other beds, and just show an empty spot. But that's easy to fix. I'm definitely going to be using this method from now on.)
I've never bothered with turning sims3packs into package files, it has all seemed a huge hassle until now, and seemed targeted for those paranoid about using the launcher. I've been fine using the launcher, so I skipped over most of those sections and ended up missing this part. This is great news for me though. I've spent hours on some custom lots before generations which I backed up, but thanks to all of the CC that got included, I haven't wanted to replace those lots into my game. Yet I haven't been too eager on rebuilding all those houses from scratch either...