Free! It’s free! The Sims 2 is free! I don’t really know what more to say. The Sims 2 is free on Origin. You’ll get all its expansions and add-on packs too. For free. Because it’s free. It’s all free.
I mean, the technical explanation is that EA have retired support for The Sims 2 and as a parting gift gave everyone who owned it on Origin an upgrade to the all-inclusive Ultimate Edition, but didn’t have an easy way to give that to disc owners too, so they’ve just tossed a free code onto the Internet. But in short: The Sims 2 Ultimate Edition is free on Origin.