I went and found the lessage that it showed up for me whenever I tried installing some of my registered games from Origin:
"DLC Compatability Alert"
It seems the base games for this DLC was not installed through Origin. For The sims 3 Into the Future Limited Edition to work, You will first need to:
1. Select "uninstall now" below, locate the base game, and follow the on-screen instructions to uninstall it.
2. Donload and install the base game through Origin by selecting it in My Games and clicking "Download"
After that, you can download and play The Sims 3 Into the Future Limited Edition"
Only this game doesn't even show up in the "Add or Uninstall a Program" thing from my control panel when I actually did click "Uninstall now"
What's the answer???
