EA MAY PROVIDE CERTAIN INCREMENTAL CONTENT AND/OR UPDATES FOR NO ADDITIONAL CHARGE, IF AND WHEN AVAILABLE. EA ONLINE PRIVACY AND COOKIE POLICY AND TERMS OF SERVICE CAN BE FOUND AT EULAS AND ADDITIONAL DISCLOSURES CAN BE FOUND ATEA MAY RETIRE ONLINE FEATURES AFTER 30 DAYS NOTICE POSTED ON INCLUDES SOFTWARE THAT COLLECTS DATA ONLINE TO PROVIDE IN GAME ADVERTISING. YOU MUST BE 13+ TO ACCESS ONLINE FEATURES. AngusZarco This isnt directly possible, as in, you cant add your Origin-owned content to your Steam library. SERIAL CODES ARE NON-TRANSFERABLE ONCE USED AND SHALL BE VALID, AT A MINIMUM, SO LONG AS ONLINE FEATURES ARE AVAILABLE. Again there are no steps required to install these files past placing them in the Tray folder, or a relevant subfolder within that. SERIAL CODE REGISTRATION IS LIMITED TO ONE ORIGIN ACCOUNT PER SERIAL CODE. How do I get my Sims 4 DLC from Origin to Steam As said above, if you want to play Sims 4 through Steam, you need to buy a copy of the base game in Steam. INTERNET CONNECTION, ORIGIN ACCOUNT, ACCEPTANCE OF PRODUCT AND ORIGIN END USER LICENSE AGREEMENTS (EULAS), INSTALLATION OF THE ORIGIN CLIENT SOFTWARE (AND REGISTRATION WITH ENCLOSED SINGLE-USE SERIAL CODE REQUIRED TO PLAY AND ACCESS ONLINE FEATURES AND BONUS CONTENT (IF ANY). The Sims 4 itself is a pretty small purchase compared to the vast quantities of expansions and stuff packs that dedicated Sims fans have assembled by now.