The key has to be activated on: http://www.thesims3.com/registeragame.html . Then you may download the game from Origin using the same login and password as on thesims3.com.

Let your Sims swim in the ocean on a hot summer day, bob for apples in the autumn leaves, test their snowboarding skill on the half pipe, or welcome spring showers with a walk in the rain and a colorful umbrella.

All-new activities, like soccer, and big seasonal festivals and celebrations bring the spirit of each season to life. Your Sims can pucker up at the kissing booth at the spring festival, or see what Halloween surprises await in the haunted house. Dress for the weather with seasonal fashions from sun dresses to raincoats and snow gear.

With new foods, décor and weather effects, your Sims can enjoy the bounty and beauty of the ever-changing seasons and play with life like never before!

Minimal requirements:

Processor: 2.4 GHz - Pentium 4

Graphics: 128 MB VRAM - NVIDIA GeForce 6 / ATI Radeon 9500

Memory: 1.5 GB RAM

Disk space: 6.1 GB HD

System: Windows XP SP2 / Vista SP1