How to Install Sims 4 CC Hair Without Breaking Your Game

What You Need Before You Start

Before downloading anything, make sure you have two things ready. First, a file extraction tool. Most CC hair downloads come in .zip or .rar archives, and while Windows handles .zip files natively, .rar files require a third-party tool. 7-Zip is free, reliable, and handles both formats. Download it once and you're set for every future CC install.

Second, know where your Sims 4 Mods folder is. The default path on Windows is: Documents → Electronic Arts → The Sims 4 → Mods. On Mac: Documents → Electronic Arts → The Sims 4 → Mods (same structure, different drive path). If you've moved your Documents folder or changed your EA App install location, your Mods folder might be elsewhere — but navigating there once and bookmarking it in your file explorer will save you time every future install.

Step 1: Enable Custom Content in Your Game

This step is easy to miss and it's why many Simmers install CC correctly but see nothing change in-game. Open The Sims 4. Before loading any save, go to Game Options (the three dots menu on the main screen), then Other. You'll see two toggles:

• Enable Custom Content and Mods — this needs to be ON
• Script Mods Allowed — this can also be ON for future flexibility, though CC hair doesn't require it

These settings reset occasionally after major game updates, which is why CC sometimes mysteriously stops showing up after a patch. Always check here first if something stops working after an EA update.

Step 2: Download Your CC Hair

Find a hairstyle you want from a trusted source — The Sims Resource, a creator's Tumblr page, Patreon, or CurseForge. Click the download link. The file will save to your Downloads folder as either a .package file (ready to use immediately) or a .zip or .rar archive (needs extracting first).

If it's a .package file, skip to Step 4. If it's an archive, continue to Step 3.

Step 3: Extract the Archive

Right-click the .zip or .rar file. For .zip files on Windows, select Extract All from the menu. For .rar files, right-click and look for the 7-Zip option in the context menu — select Extract to [folder name]. This creates a new folder containing the contents of the archive.

Inside the extracted folder, you'll find one or more .package files. These are what you need. Ignore any readme text files (though reading them occasionally reveals useful info about the CC). Ignore any .zip files within the archive unless specifically instructed to extract those too.

Step 4: Move Files to Your Mods Folder

Copy or move the .package files into your Mods folder. You can place them directly in the Mods root or in a subfolder — Simmers usually create organized subfolders like Hair_MM, Hair_Alpha, or folders by creator name. Either approach works.

One critical rule: don't nest folders more than one level deep. The game reads .package files in the Mods folder and one subfolder level down, but not deeper. So Mods/Hair/ works. Mods/Hair/CurlyHair/ does not — .package files in that second subfolder will be silently ignored. This is a common mistake and a common cause of CC that appears installed but doesn't show up in game.

Step 5: Clear the Cache and Launch

After adding new CC, navigate to your Sims 4 root folder (same location as the Mods folder) and delete the file named localthumbcache.package. This file stores thumbnail previews of all game objects including CC. Deleting it forces the game to regenerate it with your new CC included. If you skip this step, you might see gray squares instead of proper item thumbnails in CAS or build mode.

Now launch the game. On the main menu, you should see a notification that custom content was detected. That's confirmation your CC loaded. Head into CAS and look in the hair category — your new styles should be there alongside EA's base game options.

Staying Organized as Your Collection Grows

Ten CC hair files are manageable. Three hundred start to feel chaotic. Building a folder organization system early pays dividends later. Most Simmers organize either by creator name, by hair style type (curly, braids, short, long), or by aesthetic (Alpha vs Maxis Match). Pick a system that makes sense to you and stick to it.

For larger collections, the Sims 4 Mod Manager (S4MM) is worth installing. It provides a visual interface for enabling and disabling CC groups, which is invaluable when troubleshooting. You can disable an entire folder of hair CC in two clicks rather than manually moving files.

Troubleshooting: When Something Goes Wrong

Even with a correct install process, things occasionally don't work. Here are the most common problems and their fixes:

• CC not appearing in CAS at all: Check that Custom Content is enabled in Game Options. Verify the .package file isn't nested more than one subfolder deep. Delete localthumbcache.package and relaunch.
• Gray square thumbnails: Cache wasn't cleared. Delete localthumbcache.package and relaunch the game.
• Hair appears as a pink or purple block in CAS: The .package file is corrupted. Re-download from the original source.
• Game crashes after adding new CC: One of your new files is broken. Use the 50/50 method: move half your new CC out of the Mods folder, test, and keep halving until you find the culprit.
• CC disappeared after a game update: Check if Custom Content is still enabled (updates sometimes reset this). Also check if the creator has released an updated version of the CC — patches occasionally break older files.