[CURRENT ISSUE] The Sims 3 - Disc Authorisation/No Disc Errors
"Disc Authorization Failure – no game disc found! Please insert The Sims 3 disc before proceeding"
"Disc Authorization Failure – we are unable to verify that your disc is a valid copy of The Sims 3. Please contact customer service"
These disc errors have been a problem for Mac users playing The Sims 3 since it was released. Since upgrading to OS X El Capitan the number of users experiencing it has increased sharply. This is easily resolvable by uninstalling your latest (by release date) EP/SP and downloading the digital version from Origin. You don't need to purchase the EP/SP, you simply redeem your product codes in Origin and the game(s) will be available to you.
If you get the error message in Origin that your product code has already been used make sure you haven't previously registered the code under a different account. If you have you need to be logged in under that account. For merging accounts or code issues please contact EA customer support - For support, please visit the EA Help website. For instructions on how to use the EA Help services, please refer to How to use EA Help.
If you are still getting the error message after downloading and installing the EP then download and install the patch for the digital version of the game. If it still isn't working then completely uninstall your game and reinstall. For further help and instructions please read this guide.
Uninstall your most recent EP then download and reinstall the digital version from Origin. Instructions here.