Windows 11 24H2: Cleanup is no longer deleting all temporary files

[harlan4096]

Running cleanup after a successful update to a new Windows version allowed you to free up gigabytes of disk space in the past. Windows would remove old update files that it no longer needed and your PC would have several extra gigabytes of storage space as a consequence.

This changed with the release of Windows 11 version 24H2. When you try to clean up after installation of the upgrade, you will notice that Windows 11 retains more than 8 gigabytes of storage.

In other words: this data cannot be deleted. It does not work with the Cleanup tool in Settings, the classic Disk Cleanup tool, or DISM.

Why is that, you may ask. The answer is simple: because Microsoft changed how updates work on Windows 11.

Microsoft changed how updates work in Windows 11 version 24H2

To better understand the change, it is necessary to understand how updates worked prior to Windows 11 version 24H2.

The release version of Windows 11 and feature updates were baselines for updates. Any update that followed was a cumulative update. It included the changes since the release of the baseline version. As you can imagine, this increased over time.

Microsoft introduced so-called checkpoint updates in Windows 11 version 24H2. These establish new baselines for a specific feature update.

The positive effect is that the released cumulative updates are smaller, as they use the more recent baseline as reference. The downside to this is that update data may still be required.

This is happening right now when users notice that they cannot remove gigabytes of update data from their Windows 11 PCs.

The problem right now is that Microsoft is not explaining this. Users see 8.x gigabyte of temporary update data in the cleanup apps, and they wonder why these are not removed when they hit the delete button.

Microsoft is probably going to address this in the future. For now, it is unfortunately looking like a bug to users who experience it.

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