My Downloaded Sims game keeps saying it isn’t downloaded

Thanks for getting back to me! 

I don't use an antivirus and I fixed that issue but I have another issue because my game keeps reading an error code, it says "core/sims4/tuning/tunable .py". it's crashing my game, loading my game slow and when I try to click on things in my game it's slow as well. I thought it might of been from Lot 51 core but I deleted it and i'm still having this issue. I would appreciate the help because I don't know at this point.