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Reclaim Space From Old Windows Update Files

After a feature update the old installation is kept for ten days and can take many gigabytes. There are three supported places to reclaim it.

by@guidox updated:10/31/26 time:20 min level:Beginner tested on:Windows 11 24H2 works on:Windows 10, Windows 11 tools:Admin rights
TL;DR

Use **Disk Cleanup** with the **Windows Update Cleanup** and **previous installation** entries, empty the **Delivery Optimization** cache, and let Storage Sense handle the rest. Deleting the Windows.old folder by hand breaks the rollback.

Before you start

Requirements

  • Admin rights
  • Fifteen minutes
Step by step

Instructions

01

Start the system file cleanup mode

Disk Cleanup hides the update entries until it runs with the system files option. The button sits at the bottom of the dialog.

cleanmgr /sageset:1
02

Select the update and installation entries

Windows Update Cleanup and the previous Windows installation hold the bulk of the space. The second one disappears ten days after an upgrade.

⚠ warningRemoving the previous installation ends the rollback to the older build permanently. Decide before you tick it.
03

Empty the Delivery Optimization cache

Shared update content sits in its own cache. The settings page shows the size and offers a delete button that does not need a terminal.

Settings > Windows Update > Advanced options > Delivery Optimization
04

Check the update leftovers in SoftwareDistribution

Downloaded packages that were never installed stay in this folder. Stop the update services, clear the folder and start them again.

net stop wuauserv & net stop bits
tipThis is also the standard fix for updates that fail at the download stage.
05

Set Storage Sense to keep it that way

Storage Sense can clear the Downloads folder and old temp files on a schedule. Enable the download cleanup only if you do not keep files there.

Settings > System > Storage > Storage Sense
06

Measure before and after

Note the free space, run the cleanups and compare. A feature update typically frees five to fifteen gigabytes.

Troubleshooting

Common issues

The cleanup option is missing

No pending cleanup, or Disk Cleanup was not started with system files.

Space is not freed until a reboot

The old installation is released after the next restart.

The rollback option vanished

The ten-day window passed or the files were removed.

The Downloads folder emptied itself

Storage Sense. Turn that option off.

FAQ

Frequently asked

Can I run this monthly?

Yes. Only the rollback entry needs a decision each time.

Is Windows.old safe to delete by hand?

It breaks the rollback and the permissions. Use Disk Cleanup instead.

How to undo this

Nothing to undo. Files are deleted; a system image or the ten-day rollback window was the safety net before you started.

Changelog · 1 entry
  1. 2026-10-31
    First version
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