How do I install previous expansion?

I have Late Night already installed, but want to install all the rest of the expansions including an expansion that already came out before that one, which is Career. Do I firstly uninstall Late Night, install Career, and then open the launcher and update then do the same with the other expansions or do I just install it with Late Night already installed without launcher update and then continue with the rest of the packs without the launcher update but finally using step 4 from *MUST READ* How to install The Sims 3 correctly?

Also, can I play with the net on and logged into the network with the crack versions, and should I allow it to update when it asks?