Unzip the downloaded file and place all those files into your Sims 4 Tray folder, which can be found at Documents » Electronic Arts » The Sims 4 » Tray. Don't forget to download all the custom content listed. Otherwise, your sim won't look like mine. Place custom content files into the Mods folder located at [...]
Sabrina CAS Background I made for my Sabrina sim here. I hope you like it! :) Custom CAS background that replaces the default background. Remember to only use one CAS background at a time in your mods folder. Download Additional Info Download sim: here