Sims 3 Expansion Packs error messages

[LauraSimsLover]

Please help. I'm not very tech savvy. I recently bought a new MAC and iCloud transferred over my applications and files from my old MAC.  Sims 3 played on the new MAC but crashed in Buy mode several times and froze. I wanted to play the expansion packs.  I found them in my Origin Library, bought a few new ones (Generations and World Adventures) and downloaded and installed those, plus externally downloaded and installed Seasons, Ambitions, etc.  When I did so, I received the message "Sims 3 is newer than expected.  Expansion packs may not be compatible".  Then when I tried to play Sims 3, I got the error message "Are you sure you want to play while downloads are in progress?"  But I don't see any downloads in progress.  After clicking yes, Sims 3 icon opens, but when Seasons expansion pack icon opened I got "Unknown Error" and was unable to play.  I tried uninstalling Season, but now the same thing is happening with the other Expansion packs.  Did I do something wrong on install?  I am running Macos Sierra with a 3.1 Intel Core processor and 16GB of memory so that shouldn't be an issue.  Thank you for any advice or tips.

[Bluebellflora]

@LauraSimsLover

Please can you provide more information about your Mac. Instructions on how to do so here - http://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-3-Mac-Help-Guides-and-Troubleshooting/m-p/4756...

[LauraSimsLover]

I'm running state of the art, brand new, 

MacOS Sierra version 10.12.2

iMac (Retina 4K, 21.5-inch, Late 2015)

Processor 3.1 GHz Intel Core i5

16 GB 1867 MHz DDR3

Graphics Intel Iris Pro Graphics 6200 1536 MB

21.5 in built in Retina display

2.12 TB Fusion Drive

[Bluebellflora]

@LauraSimsLover

You have two issues. Firstly, your Mac's integrated Intel graphics are not supported in the game so you need to edit the .sgr files - http://answers.ea.com/t5/The-Sims-Mac/CURRENT-ISSUE-The-Sims-3-Issues-playing-on-newer-post-2013-Mac...

Secondly, there is an issue with running the game with certain add on packs in El Capitan and Sierra - http://answers.ea.com/t5/The-Sims-Mac/CURRENT-ISSUE-Unknown-Error-issue-in-Sims-3-in-El-Capitan-Sier...

Try those fixes to see if you can get the game working