Preceding that, though, you have to manually place the '.sims3pack' package into TS3 Downloads folder: in Windows, it should be located at Documents/The Sims 3/ in OS X, at Documents/Electronic Arts/The Sims 3/. Hello, onsipin, as IraGamagori wrote above, you got to install them via The Sims 3 Launcher - the first screen TS3 shows when you open the game.
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