need help with downloading my custom content and mods into my sims 4 game

My custom content and mods are not working in my sims 4 game at all and I'm needing to find help on how to work them into my game. I have tried everything and nothing seems to work. I need help on how to upload the custom content I downloaded and the mods I have for my sims 4 game. Nothing seems to be working for me at all. I haven't had any problems with my mods or custom content before now since my computer was updated to windows 11 nothing seems to be working with my sims 4 or my custom content and mods/