How can I get the Sims DLC from Steam to work with the Origin version of the base games?

Solution 1:

It works one way, but not the other. You can use the keys gained in Steam (Right click on game in left-hand menu, View Game CD Key) and activate them for your EA Games account by registering them at https://activate.ea.com, which makes them then appear in your Origin games list for installation. (This applies to most - but not all - EA Games that are available on Origin)

You cannot use Origin codes to apply games to Steam, and Steam won't let you buy DLC for games you don't own though Steam.

[2015 update: You now activate them on Origin though the client. Origin menu, Redeem Product Code.]

Solution 2:

I've contacted both vendors, and both are unwilling to assist, they both state you are required to re-purchase the game through them in order to have a "Valid License" as the digital license are not released to 3rd party clients like Steam/Origin. The License is only valid through one or the other and will not work for both. Same goes with the content. Still looking for a way to transfer the saved data after giving in and re-buying as my girlfriend loves the game and wants the content and Steam has far better prices and deals for the DLC