Problems with DLC.

catalinrus_2023​  The issue here is that you have a second install of Sims 4, through the EA App, and that install is the one that includes MFPS.  That install is here:

C:\Program Files\EA Games\The Sims 4

while your Steam install is here:

A:\Steam\steamapps\common\The Sims 4

and does not have the folder for MFPS inside it.  (The Delta folder contains patch data, not the pack itself.)  So you'll need to remove the EA App install.  You may be able to do so through the App, under Sims 4 > Manage, without affecting your Steam install.  But if not, you'll need to remove both and reinstall the game only through Steam, then download MFPS but NOT a second copy of the base game through the EA App.  Please see the "I have a Steam install" section of this post for further help:

[CURRENT ISSUE] Sims 4 DLC shows as installed, won't load in-game | EA Forums - 11831673