@JanePhoenix Sims 2 was released on the Origin store as Sims 2: Ultimate Collection. It was retired at some point from the store, but not before being offered in a mass giveaway. For a while was still granted via live chat support to anyone that could offer a proof of purchase that had the base game and all the expansions and stuff packs.
The discs are useless on Windows 10 because Microsoft blocked the old copy protection drivers and Sims 2 had SafeDisc as a copy protection (which is one of the blocked drivers), hence preventing the games to install from disc.
@LaurenRoseFlower if you can provide a proof of purchase for the base game and all of the expansions and stuff packs released, support may add Sims 2: Ultimate Collection. It doesn't happen often, but sometimes people are still managing to get it added in the Origin client via live chat support. Worth a try, i'd say.
There are two legal methods to make the discs to work, but they do require some actual knowledge of how to create a dual-boot PC or how to use Virtual Machine. The easiest way is to have a dual-boot system, which runs two Operating Systems (Windows 10 and Windows 7, the second being used for older games and it needs to be run from a different hard drive). Using Virtual Machine is a wee bit more complicated and recommended only if you have a pretty good knowledge of the said software and how to install in it an working Operating System that would run via VM.
For now, those are your options.
I agree that would be nice to see Sims, Sims 2 and the Sims Stories (Life Stories, Pet Stories and Castaway Stories) re-released and sold in the store. Those are often requested by the fans, but so far it did not happen. I loved the original Sims and the Sims Stories series, but the discs broke at some point, so they were unusable. So i would buy them again if they would be re-released. I was one of the lucky ones to be aware of the mass giveaway for Sims 2 when it was retired, so i've added it at the time to my Origin game library. The giveaway was many years ago and since Sims 2 stayed out of the store. No one complained until recently, as the disc versions could still be found and still worked in Windows 7. When the Windows 10 was released and many of us were forced to upgrade so we could play the newer games, we discovered that a lot of our old games won't work in Windows 10. We have MS to thank for that...