Can you run the Origin reset tool - https://help.ea.com/en-gb/help/origin/origin/how-to-reset-origin-on-mac/
Disable any antivirus or 3rd party firewall you have enabled too whilst trying to get it to work.
I followed the steps and made it to a User Agreement before it stopped working again. I'm having the same issue with not being able to Force Quit it.
Ok. 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-4-Mac-Help-Guides-and-Troubleshooting/m-p/4612396/highlight/true#M162
