a flavor pack is something you can download to enhance the game, or the mod your downloading but it's not needed for said download to work.
example, inteen has it's own settings that it comes with, but you can install a flavor pack that makes teens "woohoo" when they sneak out. it's just something extra to add.
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the sims 2 double deluxe is the sims 2 + the sims 2 nightlife + the sims 2 celebration stuff pack
You have to have The Sims 2 Happy Holiday Stuff pack installed.
you have to buy sims 2 buisness carreer expansion pack
There are no mermaids in any of the Sims games or expansion packs.
If you are talking about installing a Sims 2 expansion to the Sims 1, it is impossible. You can only install the Sims 2 expansion packs into the Sims 2, not The Sims 1 or 3.