Re: Why do I have to download the sims 3 when I bought the CD?

Try this method: http://answers.ea.com/t5/Mass-Effect-3/How-do-I-install-from-disc-without-download/m-p/1384#M22

Should be the same for Sims 3. Just do the same for Sims 3 instead of Mass Effect 3.

Let me know if it works.