Sims 2, aside from Legacy Edition, is abandonware. Even Ultimate Collection, because even though it's on the app, there's no official support for it. The game has been abandonware since about 2011 to a point and definitely since 2014. That's why Legacy is such a big deal.
The Sims 2 server no longer exists, so it's not possible to connect to it. You can't register the disks, even if you somehow found codes that weren't already used, because there's nowhere to register to. The disks don't want to install properly, because they cannot connect and update. IMO any store that sells abandonware without a warning is being dishonest.
All that said, you might be able to get it to work. I didn't dig into it too far because I'm using Legacy and have Ultimate Collection if I wanted to go back to that, but if you google the issue, there are workarounds that may work for you, depending on your system.
