Same thing happened to me today.
Since yesterday I was having major issues running The Sims 4.
Today, via chat, EA support told me to upgrade my mac to macOS Catalina (I was on Yosemite before), to uninstall The Sims 4 and uninstall origin and to reinstall origin and The Sims 4 all over again.
My installation can't even be complete with success. Midway installation, the following message appears on the screen (maybe after about 10 to 15 minutes of progress):
Error: A redistributable package (setLocale.zsh) was not installed successfully. Setup cannot continue.
How can it be EA/Origin, how? I'm so tired of your constant need to do updates...
The game was running just fine and bam! Another problem, another whole month (maybe forever?) without true support.
We need help and we are simply left hanging...
My original game plus packs took about 25GB of storage. Now, all I see is a softed colored The Sims 4 icon with a forbidden symbol on my "Applications" folder taking about only 17GB of space.
Something is missing, but what? Everytime I try to complete the installation, the same error occurs and the same message appears on my screen.
We are in this together folks. Let's make this ride as short as possible.