How to Find and Remove Duplicate Sims 4 Package Files

Duplicate Sims 4 packages waste space, slow down troubleshooting, and can leave an old version loading when you thought you installed an update. The safest cleanup method is to back up first, identify byte-for-byte duplicates, keep one clearly sourced copy, and quarantine the extras before deleting them permanently.

Do not remove every “conflict” reported by a tool. Two files can modify the same game resource intentionally without being identical duplicates. Exact duplicates, conflicting overrides, and alternate versions are three different problems.

What counts as a duplicate?

Exact duplicate

Two files contain the same bytes, even if their filenames are different. A file-hash comparison can identify these reliably. Keeping one copy is enough.

Same mod, different versions

An old and new release may have different contents but serve the same purpose. Keep the current version recommended by the creator and remove the older one after confirming that the update is complete.

Resource conflict

Two packages edit one or more of the same resources. This may be accidental, but it may also be expected—for example, two default eye replacements compete because only one can be active. A conflict report requires interpretation; it is not a duplicate list.

Similar-looking CC

Two black T-shirts or nearly identical hairs are not technical duplicates if they are separate packages. Remove one only as a curation choice.

Step 1: Make a safe copy

Close The Sims 4. Copy the entire Mods folder to a dated backup outside the active Sims 4 user folder. Create a DUPLICATE_QUARANTINE folder on the Desktop or another safe location—not inside Mods.

If Documents is synced, pause OneDrive or iCloud Drive temporarily. Cloud tools can create files such as name (1).package or restore a deleted copy from another device, which is often how duplicate collections begin.

Step 2: Start with filename searches

Search Mods for common copy patterns:

• (1) or (2)
• copy
• duplicate
• old
• backup
• Repeated creator and collection names

Matching filenames are clues, not proof. Compare file sizes and dates, then use hashes or a package-aware tool before removing anything.

Also look for the same collection in multiple category folders. A set may appear once under Furniture and again under the creator's name after a later download.

Step 3: Compare file hashes

A cryptographic hash acts like a fingerprint for file contents. If two .package files have the same secure hash, they are byte-for-byte identical.

On Windows, PowerShell can calculate hashes without third-party software:

Get-ChildItem -Path "$env:USERPROFILE\Documents\Electronic Arts\The Sims 4\Mods" -Filter *.package -Recurse |
  Get-FileHash -Algorithm SHA256 |
  Group-Object Hash |
  Where-Object Count -gt 1 |
  ForEach-Object Group

On Mac, open Terminal and use a read-only command to list SHA-256 values:

find "$HOME/Documents/Electronic Arts/The Sims 4/Mods" -type f -name '*.package' -exec shasum -a 256 {} \;

The Mac command prints hashes but does not group them; sort or compare repeated hash values. If your Documents folder is in iCloud Drive, adjust the path to the active Sims 4 folder. Neither command deletes files.

If command-line tools feel uncomfortable, use a reputable package manager with duplicate detection. Sims 4 Mod Manager documents a duplicate-file tool. Download utilities only from the developer's official site, review what they flag, and prefer moving extras to quarantine yourself.

Step 4: Decide which copy to keep

For exact duplicates, prefer the copy that:

• Lives in the correct creator/category folder
• Retains the original creator filename
• Has a saved source URL or update note
• Is not nested inside a backup or extracted duplicate directory

Move the other copies to DUPLICATE_QUARANTINE. Do not delete the only copy merely because its timestamp is older; archive extraction can change timestamps, and two exact duplicates are functionally the same.

For different versions, return to the creator's official page. Compare filenames, version numbers, required components, and update instructions. Some updates require replacing multiple files, while others offer mutually exclusive choices.

Step 5: Test before permanent deletion

After moving duplicates out:

1. Delete localthumbcache.package from the main Sims 4 user folder.
2. Launch a temporary save.
3. Check CAS thumbnails and swatches.
4. Open a test lot containing relevant Build/Buy CC.
5. Test important script mods and functional objects.
6. Keep the quarantine until you have completed several normal play sessions.

If an item disappears, restore the quarantined copy and verify whether the “duplicate” was actually a required separate file with a confusing name.

Why duplicate cleaners can report too much

Package-aware tools may also find resources shared by several files. That is useful for diagnosing default replacements or overrides, but shared resources do not automatically mean one file is safe to delete. Current versions of Better Exceptions can help report meaningful conflicts, yet a report still needs to be checked against creator documentation.

Never use an automatic “delete all conflicts” action on your only Mods folder. Review exact duplicates separately from overrides and script-mod conflicts.

Prevent duplicates from returning

Keep one folder per creator or collection, use a dated testing inbox, and replace updates instead of dragging them over an unknown old structure. Preserve original filenames. Before re-downloading a set, search Mods for both the creator and collection name.

For bigger libraries, record a source URL and installed date. Our large Mods folder organization guide includes a structure built for easy update checks.

Final safety check

The goal is not the smallest possible Mods folder. It is one clear, supportable copy of every item you intentionally use. Quarantine first, test second, and delete only when you are certain the game no longer relies on the extra file.