Another important note, you need to be on the official sims 3 CAW download website before you attempt to download from the link above, as searching it via right click won't work. So just visit ( https://www.thesims3.com/game/tools/world ) and click agree to the TOS, then select the button that matches your game version (you can see this in the launcher menu in the lower left corner). You will want to copy/paste the executable (.exe) link that I mentioned above, then hit enter. This will manually begin the download!
