The Sims 4 September 22 Update and Mods need a more careful approach now that Patch 1.128 is live. EA has confirmed that an outdated-mod conflict was responsible for its top automated crash report during the latest stability investigation, making a clean post-patch test especially important.
The Sims 4 September 22 Update and Mods do not mean every mod is broken. What changed on September 22 is the game version and several systems used by tuning, autonomy, saves and UI behaviour, so each mod needs a current status from its creator or a trusted compatibility list before it goes back into an important save.
The Sims 4 September 22 Update and Mods: what to do first
The Sims 4 September 22 Update and Mods Image Electronic Arts.
The Sims 4 September 22 Update and Mods are safest when you separate the game update from your custom files. Before opening a household you care about, make a copy of Documents > Electronic Arts > The Sims 4 and keep that backup outside the live game folder.
- Close The Sims 4 and the EA app completely.
- Back up the full The Sims 4 user folder.
- Move the Mods folder to a temporary location.
- Delete localthumbcache.package after removing or replacing mods.
- Launch Patch 1.128 without mods and test a disposable save.
- Check mod creators for Patch 1.128 compatibility or updates.
- Return compatible files gradually and test between groups.
EA’s live notes explain why the clean test matters in EA’s official September 22 patch notes. The Sims 4 September 22 Update and Mods guidance should start with the official game state before any third-party file is blamed or cleared.
Patch 1.128 reset mod compatibility checks
The Sims 4 September 22 Update and Mods arrived with enough underlying changes that major community trackers reset current mod statuses for Patch 1.128. A mod that worked on 1.127 is not automatically confirmed for 1.128 until its creator or a trusted tester has checked it.
That does not mean a blank or unknown status equals broken. It means the file has not yet been cleared for the new patch. Avoid treating social posts or one player’s error as confirmation that a popular mod is incompatible.
What EA found during the crash investigation
The strongest reason to be cautious with The Sims 4 September 22 Update and Mods comes directly from EA. Its highest automated crash report was traced to outdated mod files, and the patch includes a defensive change for a mod-related memory corruption problem affecting a moderate number of players.
For troubleshooting, that means the clean game is your baseline. If Patch 1.128 works with no Mods folder but fails as soon as old files return, the next step is compatibility testing rather than repairing or reinstalling the entire game.
Use the 50/50 method for an unknown problem
When The Sims 4 September 22 Update and Mods work until a large folder is restored, use the 50/50 method. Divide the Mods folder into two groups, add one group to the clean game, delete localthumbcache.package and test again. Keep halving the problem group until the responsible file is isolated.
Large script mods, UI mods, autonomy overhauls, careers and files that change interactions are sensible candidates to test separately because Patch 1.128 touches many related systems. Do not assume ordinary CAS or Build/Buy custom content is harmless either, but prioritising files by how deeply they alter gameplay can speed up the search.
Mods disabled after the update does not mean they are broken
The Sims 4 September 22 Update and Mods can also create a simpler problem: the game may disable custom content and script mods after patching. Open Game Options > Other and check Enable Custom Content and Mods plus Script Mods Allowed, then restart the game completely.
If everything is still missing, confirm that the game is reading the same Documents > Electronic Arts > The Sims 4 folder you are editing. OneDrive or another synced Documents location can make it look as though a patch deleted files when the game has actually switched folders.
Do not save over an important household while testing
The Sims 4 September 22 Update and Mods should be tested in a disposable save until your essential files have been cleared. Opening and saving a heavily modded household without its required mods can remove objects, traits, careers or other custom data from that save.
Keep the untouched backup until you have completed several stable sessions. The Sims 4 September 22 Update and Mods will be much less painful if compatibility checks happen before the main save becomes part of the experiment.
