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.

Thanks for the help. I already managed to locate the damaged file in the EP03 Folder. It was a thumbnail Cache for the Map Screen of the City Living World. I deleted the file and now the game and the DLC work as intended. Ofcourse now there are some thumbnails missing on the City living map screen but i would say they are not really necessary 😀. If i encounter a Problem again with this Pack i will try ur suggestion. But rn everything seems fine. Thanks again for the help👍