Where can I download Spore?

I have a product code from when I bought the game back in the day, and I'd like to play it on my laptop. I don't have it installed and the DVD-Drive on my laptop is a bit wonky. Where can I obtain this legally? Again, I'll reiterate that I have the CD-Key or "Product Code" or whatever you want to call it.

I'd like to do this legally rather than just torrenting the game, which may come already cracked/hacked/etc.

Thanks for any help!