If you're getting this error Sims 4 is already running - ed35e0ea:29f00e76:00000000:18a1dd51
Please post about it in the Sims Mac Board -
Some technical issues need to be handled differently because they both are running different operating systems. Mac computer don't have Task Manager, but they probably have something similar.
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Also running SiM on Windows 7 SP 1, getting the same error. I uninstalled sim , origin, and ran a service pack update , took origin out of the start up folder ....
** SAME ERROR this has to be a bug in the game, where are the EA people to fix this!!!!!!!!!!!!