If you try to install this extension you get the message "You need to be logged in to your Sims 3 community account to register the game." Without never forget. The game is therefore useless for me and not compatible with the rest. Do not buy it if you want to stay offline. I know that there was already extensions for which you had to register online, but the online download extensions were. For the first time so it's so that you can install as a DVD-extension of the game is no longer easy. Too Bad.