@Skyward_juice1 If you own all your packs on disc, and your base game disc was manufactured prior to September 2012, then you can install the game the same way you'd install anything else from disc. Just make sure that neither Origin nor the EA App is installed on your computer at the time, and if you do reinstall one of them later, disable automatic game updates and make sure the launcher doesn't try to update Sims 3 anyway.
To find out the age of your base game disc, check the fine print on the back of the case. Newer versions also have the Origin logo somewhere on the case.
@puzzlezaddict one of the expansion packs was from 2012, the base game and other expansion packs are from 2013. It probably wont work then, right?
@Skyward_juice1 Correct, your base game disc is new enough that it'll require you to install and play through Origin.
