How do I reinstall my Sims 3 Ambitions Expansion pack on my PC?

I want to reinstall my sims 3 Ambitions expansion pack, however I bought the digital copy off Amazon, so there is no disc. I still have the security code though. My order for that game is no longer in my order history on Amazon. How can I reinstall it without having to buy it again? I already have all the other... show more I want to reinstall my sims 3 Ambitions expansion pack, however I bought the digital copy off Amazon, so there is no disc. I still have the security code though. My order for that game is no longer in my order history on Amazon. How can I reinstall it without having to buy it again? I already have all the other sims 3 expansion packs installed.
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