Hi there was wondering if anyone else stumbled upon this issue while trying to download old sims 3 expansion packs! I had the base game and the expansion pack ambitions already on CD. The base game downloaded, installed and worked fine. The issue was when I tried to hit the download now button on the ambitions expansion pack I literally could not. I looked at the forums and my issue was not relating to the technical but more so the fact that it says I require the sims 3 starter pack and I only have the base game I think. I want to get other expansions but I feel like this might be an issue continuously.
I had that same problem when I started back up playing. What ended up fixing mine was: My game launcher did not have the current updated version. (I have a pc and play on windows 7. I also use origin). Down on the bottom left corner of your game launcher what version does it say? and do you use a pc or mac and steam or origin? Oh and also make sure you are using the same account name that your base game is installed under.