@MadameLee in KittySims4's download, after you unzip the .rar file her tray files are in a folder marked Tray. You will need to copy and paste the 7 files inside the folder to your tray folder. DO NOT copy it as a folder as subfolders will not show up in the game. Everything ending in .package goes in the mods folder.
Rule of thumb: The tray folder is for houses or other builds. All .package files go in your mods folder.
Comments
Rule of thumb: The tray folder is for houses or other builds. All .package files go in your mods folder.
I figured it out thanks!!