Things You'll Need
Instructions
Super Patcher
Download the Super Patcher from the Electronic Art's website (see Resources).
Right-click the downloaded executable file and select "Run as Administrator."
Follow the installer's prompts to complete the installation.
Launch the game to download any additional updates.
Origin
Back up your saved "The Sims 3" games by clicking the "Start" icon on the Windows taskbar, then clicking "Documents" and "Electronic Arts." Copy "The Sims 3" folder to your desktop.
Uninstall "The Sims 3" by selecting "Start," "Control Panel" and then "Uninstall a program." Uninstall any installed expansion packs as well.
Download the Origin software from origin.com/download. Install the software and run it to update to the latest version.
Reinstall "The Sims 3" but not install any expansion packs at this point.
Open Origin by right-clicking the desktop shortcut and selecting "Run as Administrator."
Open "The Sims 3" launcher by right-clicking the desktop shortcut and selecting "Run as Administrator." The game begins updating automatically. The patcher notifies you when the update is finished.
Re-install any expansion packs in the following order: "World Adventures," "High-End: Loft Stuff," "Ambitions," "Fast Lane Stuff," "Late Night," "Outdoor Living Stuff," "Generations" and "Town Life Stuff."