To be honest, I don't know my way around that. I had Sims 3 but my mum installed it for me when I was a little kid and now I've just got Sims 4 and I have no idea what to do. My laptop is opening some files. Maybe you can help me?
You have inserted CD2, you have to start with CD1.
Now you can see CD2 - you have to insert CD1, which should start automatically.
Then follow the instructions.