Re: City Living prevents game from launching
@Prof_Creep Please uninstall the EA App using Revo Uninstaller (the free version is fine). I'm not sure this is strictly necessary, but it's extremely thorough.
Go into the program files for Sims 4, which will be here by default:
C:\Program Files (x86)\steam\steamapps\common\The Sims 4
and delete the EP03 folder, which corresponds to City Living. Then open Delta and delete the EP03 folder there as well; this holds patch data for CL. Repair the game in Steam again, restart your computer, and install the EA App. Please test Sims 4 once before downloading CL from the App again. Let me know how it goes both before and after reinstalling the pack.