@lollyfarberabe The Sims 3 folder in Program Files contains the game's program files, as in, what Origin or the EA App installs. The folder in Documents > Electronic Arts is the user folder. If you move the game's program files, then of course the EA App is going to think Sims 3 is no longer installed and prompt you to download it again. That's why the suggestion is specifically to move the folder in Documents.
The error you saw when trying to move the folder in Documents may be due to OneDrive, so please let me know whether it's running, even if you don't use it, and how full it is.
I can confirm that it is still working today.
Thank you again.
EDIT : Two items refuse to install telling me that I need an add-on but I have them all (and used these items before the EA App transition) and I've checked, I didn't lose any add-on during the transition.
@lollyfarberabe Which items are these, and is the add-on required loading in-game?
