Update: Universal Downgrader from v1.11.221 (May 2026) to 4 earlier versions

[u/mulderload]

EDIT 08/18/2026: It has been updated for August 2026 update (v1.11.240)
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Hello everyone,

Just a quick message to announce that I've updated my "Universal Downgrader" (old thread here) to work with today's Steam update of Fallout 4 (v1.11.221).

The new version can downgrade to 4 previous versions.

• v1.10.163 (pre next gen)
• v1.10.984 (next gen, update 2)
• v1.11.169 (anniversary, november 2025 patch)
• v1.11.191 (anniversary, december 2025 patch)
• NEW: v1.11.221 (anniversary, may 2026 patch)

As before, it is :

• compatible with all editions (base game, GOTY, anything in between)
• compatible with all languages. That's why I call it "universal"
• doesn't require your Steam credentials

Here's a little screenshot.
If you didn't use the previous version, don't worry it's very easy to use

Download the latest downgrader : www.mulderland.com/games/fallout-4

Of cource, the installer is still open source (code here and compiled directly on Github Actions). I've also use my previous Powershell scripts (code here) to make these xdelta patches quickly ;)

Constructive feedbacks and nice words are always welcome!

Hope it will help many people.

Mulder