Since I have found out how to install multiple.sims2pack files with sims2pack clean installer, my post is more about the problem i have encountered with multi-sims2pack installer. I think it's good to let the others know, so they are aware of it before they delete their.sims2pack files. Download the latest version here: Sims2Pack Clean Installer A french translation of the S2PCI documentation (by Majunta) can be found here (external link).
These instructions are to completely delete everything Sims related from your Mac – CC/Mods/Saves/Downloads, everything (to manually uninstall a single EP/SP please read ). If you’re having problems with your game this is a last resort but it will only work if you really get rid of everything.
Even then it’s not 100% guaranteed that your game will work again after reinstalling but it should give it the best chance possible. A lot of Preference files are left behind when you uninstall The Sims 3 using the Uninstaller in the Applications folder. In order to make sure you have a completely clean uninstall of the game, follow the steps below. Please note that the Preferences folder has really important files in it so make sure you don’t delete ANYTHING apart from the files mentioned below.