okay I signed up just to let you know what I found out— EA was installed (so goes the sims) in “Program Files” instead of “Program Files (x86)” on my computer (I am not a techy person so forgive me)
On the left hand side of the file screen, at the very bottom I clicked the little arrow next to “OS (C:)”. It will open more option branches. Scroll to the file “Program Files” NOT “Program Files (x86)” and click that little arrow. Then click the little arrow next to “EA Games” folder and then “The Sims 4” and there is where you will find the Data and Delta files I spent hours searching for. I really hope this helps, I’m terrible at explaining. And again, this is how it was on my computer so I hope it helps.