Solved
What is the best way to uninstall then reinstall the Sims 4?
I have the codes replacing my ghost actions, achievements and The Gallery download button. I see the solution to try is Uninstalling my Sims 4 and then reinstalling. What is the best way to do this...
First try if repair game on the Origin client helps (right clic on the game).
If it doesn't, uninstall the game through your install panel (or Origin), then run ccleaner to clean out the registery and then reinstall.
If you have troubles afterwards, try this: http://answers.ea.com/t5/The-Sims-4/FAQ-Manually-uninstalling-The-Sims-4/m-p/3447927
