If its been completely installed then all you need to do is put in the sims 2 you used just before seasons. Simple.

Seasons is an expansion pack to the original Sims 2 game. You can't run an expansion without the base game. You can buy the game or download it illegally
u can follow this link
http://www.jumptags.com/petersiw
also use drop down menu with your query

Here is a way to play your sims that you got as a torrent you just fallow the steps and you will be playing your game in no time good luck...
ok.....u need to have a software which can virtually mount the images for u
since u know how to use torrentz......click on this

http://torrentz.com/f5436481d0041374311b…

then once u have finished downloading the software...install it and open it
wen u'll open it....on the left side u'll see an option as "virtual drive"
click on it...and select number of devices as 3

then come back to the main screen...and on the main white screen...right click and click on add images...add the .iso files u have
then....after u have added the images....right click on them and click on "mount on device"
after u mount those images.....they'll act as if u have inserted the dvd into ur dvd-rom
and u'll know wat to do next....install and enjoy