The best way to check if your mods have been correctly installed is by opening the game, heading to settings>game options>other, and look for the section labeled “Enable Custom Content and Mods” and “Script Mods Allowed” and ensure they are both ticked. Additionally, you will need to have the game closed for the mod to be implemented. Otherwise, the mod will not install into the game properly.
After this, open The Sims 4 file on your PC, and place the extracted files into the mods folder. Similarly to any other mod you install, you will need to download the Zip File from the Slice of Life Mod Page first and extract the files once the download is complete. When it comes to installing mods into The Sims 4, the process is straightforward.