It's super easy, just download, unzip, and put ONLY ONE of the .package files in your mods folder! That's it!

Directory

The Install Directory is usually locatd under:

• /Documents
  • /Electronic Arts
    • /The Sims 4
      • /Mods

Make sure you have enabled Mods in your game’s settings! Go to settings/other and check the little boxes “enable custom content” and “enable script mods”

That’s it! Enjoy!