Summary

This update includes reliability improvements to Windows Update Service components in all editions of Windows 10, version 1507, 1511, 1607, 1703, 1709, 1803, 1809, 1903, 1909, 2004, 20H2, and 21H1. It may take steps to free up disk space on your device if you do not have enough disk space to install Windows updates.

This update includes files and resources that address issues that affect the update processes in Windows 10 that may prevent important Windows updates from being installed. These improvements help make sure that updates are installed seamlessly on your device, and they help improve the reliability and security of devices that are running Windows 10. 

Important:  If your device is out of support, it is no longer receiving security updates from Microsoft and may become more vulnerable to security risks and viruses. For this reason, we strongly recommend that you update to the latest version of Windows 10. Each version of Windows 10 is supported for 18 months. After support ends, you must update to a newer version of Windows 10 to continue receiving Windows updates and security fixes. To learn more about the Windows lifecycle, see Windows lifecycle fact sheet

Notes: 

  • For more update information for Windows 10, version 1809, 1903, and 1909, see KB 5001716.

  • This update may request your device to stay awake longer to enable installation of updates.

    Note The installation will respect any user-configured sleep configurations and also your "active hours" when you use your device the most.

  • This update may try to reset network settings if problems are detected, and it will clean up registry keys that may be preventing updates from being installed successfully.

  • This update may repair disabled or corrupted Windows operating system components that determine the applicability of updates to your version of Windows 10.

  • This update may compress files in your user profile directory to help free up enough disk space to install important updates.

  • This update may reset the Windows Update database to repair the problems that could prevent updates from installing successfully. Therefore, you may see that your Windows Update history was cleared.

Important information about devices that have low disk space

When a Windows feature update is available for your device, you may see a message on the Windows Update settings page or elsewhere that asks you to free up disk space by removing files or applications that you do not use regularly. If you see this message, select Fix issues to free up disk space on your device.

After the Windows update has installed, some users may be prompted to restart their device. See Free up drive space in Windows 10 for more information about other ways that you can free up disk space on your device.

Compressing files

To help free up disk space, this update may compress files in your user profile directory so that Windows Update can install important updates. When files or folders are compressed, they appear as having two blue arrows overlaid on the icon. Depending on your File Explorer settings, you may see icons that look larger or smaller. The following screen shot shows an example of these icons.

Icons of compressed files

After you install the update, your files are restored to their original state, and the blue arrows disappear from the file icons in File Explorer. At any point during the update process, you should be able to access your files.

Microsoft Support notification

This update may display a notification on devices that are running low on space. If selected, this notification will open a Microsoft Support URL in the default browser with contact options for Microsoft support so you can easily get help freeing up space on your device.

This PC is running low on space

Disk Cleanup

When this update is installed, new options for cleaning up disk space will be available to make it easier for you to update your device when it is low on disk space. If a feature update fails due to a low disk space, you can help increase storage space by using the Disk Cleanup tool or selecting “Free up space now” in Settings / Storage. These will help you remove unused files and free up storage space before a major feature update.

Figure 1 Figure 2

How to get this update

Release Channel

Available

Next Step

Windows Update and Microsoft Update

Yes

None. This update will be downloaded and installed automatically from Windows Update.

It is also offered directly to Windows Update Client for some devices that have not installed the most recent updates.

Microsoft Update Catalog

Yes

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Important The update that is available from the Microsoft Update Catalog applies only to all editions of Windows 10, version 1507, 1511, 1607, 1703, 1709, and 1803.

Windows Server Update Services (WSUS)

No

See the other options.

Note This update is currently not needed on devices that are administered through Windows Server Update Services.

Note: Only builds of Windows 10, versions 1507, 1511, 1607, 1703, 1709, 1803, 1809, 1903, 1909, 2004, 20H2, and 21H1 require this update.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

Windows 10, version 2004, 20H2, and 21H1

File name

File size

Date

Time

Fileinfo.xml

2,112

10-Sep-2021

16:56

Packageinfo.xml

573

10-Sep-2021

16:55

Packagestructure.xml

331

10-Sep-2021

16:56

Prebvtpackageinfo.xml

383

10-Sep-2021

16:56

Windows10.0-kb4023057-x64.cab

1,012,091

09-Sep-2021

14:59

Compdb.xml

779

09-Sep-2021

14:58

Compdb.xml.cab

9,097

09-Sep-2021

14:59

Compdb_cab_publish.xml

482

09-Sep-2021

14:59

Compdb_publish.xml

590

09-Sep-2021

14:58

Unifiedinstaller.exe

131,408

09-Sep-2021

04:47

Updhealthtools.cab

941,851

09-Sep-2021

14:57

File name

File size

Date

Time

Fileinfo.xml

2,111

10-Sep-2021

16:57

Packageinfo.xml

573

10-Sep-2021

16:56

Packagestructure.xml

331

10-Sep-2021

16:57

Prebvtpackageinfo.xml

383

10-Sep-2021

16:57

Windows10.0-kb4023057-x86.cab

860,292

09-Sep-2021

10:40

Compdb.xml

774

09-Sep-2021

10:39

Compdb.xml.cab

9,081

09-Sep-2021

10:40

Compdb_cab_publish.xml

480

09-Sep-2021

10:40

Compdb_publish.xml

588

09-Sep-2021

10:39

Unifiedinstaller.exe

99,656

09-Sep-2021

04:43

Updhealthtools.cab

797,943

09-Sep-2021

10:37

Windows 10, version 1903 and 1909

File name

File size

Date

Time

Fileinfo.xml

2,114

10-Sep-2021

16:52

Packageinfo.xml

573

10-Sep-2021

16:51

Packagestructure.xml

331

10-Sep-2021

16:52

Prebvtpackageinfo.xml

383

10-Sep-2021

16:52

Windows10.0-kb4023057-x64.cab

1,074,688

09-Sep-2021

13:05

Compdb.xml

780

09-Sep-2021

13:04

Compdb.xml.cab

9,079

09-Sep-2021

13:04

Compdb_cab_publish.xml

486

09-Sep-2021

13:04

Compdb_publish.xml

594

09-Sep-2021

13:04

Unifiedinstaller.exe

129,848

09-Sep-2021

05:31

Updhealthtools.cab

1,004,685

09-Sep-2021

13:03

File name

File size

Date

Time

Fileinfo.xml

2,112

10-Sep-2021

16:52

Packageinfo.xml

573

10-Sep-2021

16:51

Packagestructure.xml

331

10-Sep-2021

16:52

Prebvtpackageinfo.xml

383

10-Sep-2021

16:52

Windows10.0-kb4023057-x86.cab

905,612

09-Sep-2021

10:18

Compdb.xml

774

09-Sep-2021

10:17

Compdb.xml.cab

9,070

09-Sep-2021

10:18

Compdb_cab_publish.xml

484

09-Sep-2021

10:18

Compdb_publish.xml

592

09-Sep-2021

10:17

Unifiedinstaller.exe

98,640

09-Sep-2021

05:24

Updhealthtools.cab

844,397

09-Sep-2021

10:16

Windows 10, version 1809

File name

File size

Date

Time

Fileinfo.xml

2,113

13-Sep-2021

18:32

Packageinfo.xml

573

13-Sep-2021

18:31

Packagestructure.xml

331

13-Sep-2021

18:32

Prebvtpackageinfo.xml

383

13-Sep-2021

18:32

Windows10.0-kb4023057-x64.cab

1,064,840

09-Sep-2021

14:08

Compdb.xml

779

09-Sep-2021

14:07

Compdb.xml.cab

9,098

09-Sep-2021

14:07

Compdb_cab_publish.xml

485

09-Sep-2021

14:07

Compdb_publish.xml

593

09-Sep-2021

14:07

Unifiedinstaller.exe

131,408

09-Sep-2021

05:46

Updhealthtools.cab

994,483

09-Sep-2021

14:06

File name

File size

Date

Time

Fileinfo.xml

2,112

13-Sep-2021

18:32

Packageinfo.xml

573

13-Sep-2021

18:32

Packagestructure.xml

331

13-Sep-2021

18:32

Prebvtpackageinfo.xml

383

13-Sep-2021

18:32

Windows10.0-kb4023057-x86.cab

900,911

09-Sep-2021

10:40

Compdb.xml

774

09-Sep-2021

10:39

Compdb.xml.cab

9,078

09-Sep-2021

10:40

Compdb_cab_publish.xml

483

09-Sep-2021

10:40

Compdb_publish.xml

591

09-Sep-2021

10:39

Unifiedinstaller.exe

99,656

09-Sep-2021

05:20

Updhealthtools.cab

839,234

09-Sep-2021

10:38

Windows 10, versions 1703, 1709, and 1803

File name

File size

Date

Time

Fileinfo.xml

641

14-May-2021

18:16

Packageinfo.xml

575

14-May-2021

18:15

Packagestructure.xml

168

14-May-2021

18:16

Prebvtpackageinfo.xml

385

14-May-2021

18:16

Windows10.0-kb4023057-x64.cab

1,899,120

12-May-2021

01:33

Windows10.0-kb4023057-x64.msi

2,043,904

12-May-2021

01:32

File name

File size

Date

Time

Fileinfo.xml

641

14-May-2021

18:15

Packageinfo.xml

575

14-May-2021

18:15

Packagestructure.xml

168

14-May-2021

18:15

Prebvtpackageinfo.xml

385

14-May-2021

18:15

Windows10.0-kb4023057-x86.cab

1,560,479

11-May-2021

11:06

Windows10.0-kb4023057-x86.msi

1,699,840

11-May-2021

11:05

Windows 10, versions 1507, 1511, and 1607

File name

File size

Date

Time

Fileinfo.xml

641

14-May-2021

18:16

Packageinfo.xml

575

14-May-2021

18:15

Packagestructure.xml

168

14-May-2021

18:16

Prebvtpackageinfo.xml

385

14-May-2021

18:16

Windows10.0-kb4023057-x64.cab

1,899,120

12-May-2021

01:33

Windows10.0-kb4023057-x64.msi

2,043,904

12-May-2021

01:32

File name

File size

Date

Time

Fileinfo.xml

641

14-May-2021

18:15

Packageinfo.xml

575

14-May-2021

18:15

Packagestructure.xml

168

14-May-2021

18:15

Prebvtpackageinfo.xml

385

14-May-2021

18:15

Windows10.0-kb4023057-x86.cab

1,560,479

11-May-2021

11:06

Windows10.0-kb4023057-x86.msi

1,699,840

11-May-2021

11:05

References

Learn about the terminology that Microsoft uses to describe software updates.

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