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But you cannot purchase (or install) SPs and EPs on Steam without owning the base game on Steam, and you can't get their keys until you install and run them.
Aslong as I can buy them and play them it doesnt matter what its on. Just didnt wanna buy them if i cant use the Origin games i already own
I just bought Sims 3 together with "Into The Future" DLC on Steam. Then on the Sims 3 page in my game library I clicked on "Product Codes" and activated the DLC on my friends Origin account.
DLC is downloading right now. No need to install Sims 3 on your Steam machine / steam account, but you need to buy Sims 3 base game in order to be able to buy the Sims 3 DLCs on steam.