package custom content (hereby known as CC) was: The original path of where you needed to go every time you wanted to add a new piece of. Prior to Patch 1.12, the location of the Mods and Packages folder was rather confusing.
ModTheSims & SimsWiki have a wonderful guide on how to do it, but I feel like it’s a bit too basic, and this is why I’m going to try and include as much detail as I can without making it too messy and too hard to read. You can also find it over on her Tumblr page – (for help on installing Mods in The Sims 4, please read her great guide here). She did post it over on the official forums but sadly EA kept deleting it.
ItsaprilXD has written this brilliant tutorial on how to install mods on a Mac for The Sims 3.