Well, I had uninstalled all game data previously to see if that helped (it didn't...); so, Origin made the recent update in background while the EA-App wanted to.be installed - which I didn't, because of the new background new install of ThEeSims4. Maybe, but only maybe, this can work for you, too. The procedure would be to
- save your game
- close Origin by using task manager
- copy save files & mods
- uninstall origin, game AND anything related to EA (best by using some free uninstaller)
- install Origin
- wait for your game(s) to be downloaded (and updated instantly) and "ready to play"
- uninstall Origin
- install Origin again
- start your game (be fast...)
That's how I did it, and it worked perfect.
Anyway, it will take some time and is risky though; so, better think twice if it's worth it...