the sims 2 is a couple of GB but not nearly as much as the Sims 3 is
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If i put the Game Sims Unleashed CD in, How do i make it upload?
You don't do that in sims 2 only in the new game - sims medieval.
Your computer may not meet the sims 2 game requirements.
if you have The Sims 2 and The sims 2 pets, install the sims 2 first and yes you need all four discs and the game case with the code. Then you can install the sims 2 pets and you will also need the manual for the Sims 2 pets or the game case for the code to install the game.
Sims Castaway is a totally separate game.