Re: Late Night expansion disc validity message

The fastest and easiest way is to register your game with Origin and download and install it from there without any disc.

Once you have registered your game in the Origin client or on the Sims 3 website, you can always download and install it from the Origin client. Read more about how to register the game here:

[Information] How to Register The Sims 3

You can download the Origin client from here:

http://www.origin.com/download

Please make sure that you use the same email and password for both the Origin client and the Sims 3 website.