Don't do it. I was playing offline too, but made the mistake of updating. It's completely changed my game and not in a way I enjoy. The "Wants and Fears" are a pain. And not sure how you play, but I turned off the "spotlight" for celebrities (I even delete all the in game celebrities because I hate the disruption they cause). While I still have this turned off, I have two of my sims who have become celebrities because of their jobs. So now my own sims are causing the disruptions. I don't own HSY so I can't tell you anything about that part of things. I haven't gotten it yet because I'm still annoyed on how it has effected my game by just existing... so I'm throwing a tantrum of sorts. But let me tell you, I was a lot happier with my game before I updated.