Note
- Windows Secure Boot certificate expiration
- Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start and operate normally, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
- You can check your PC status on the Windows Security app. If you are an IT administrator, follow the guidance on the Secure Boot Playbook for Windows clients and Windows Server.
Summary
This update makes improvements to Windows setup binaries or any files that setup uses for feature updates in Windows 11, version 24H2, Windows 11, version 25H2, and Windows Server 2025.
How to get this update
Install this update
To install this update, use one of the following release channels.
| Available | Next step |
|---|---|
|
This update is available through Windows Update. It will be downloaded and installed automatically. |
| Prerequisites | There are no prerequisites to apply this update. |
|---|---|
| Restart information | You do not have to restart your computer after you apply this update. |
| Update replacement information | This update replaces the previously released update KB5066990. |
File information
The English (United States) version of this software update installs files that have the following attributes. This update might contain files for additional languages.
For all supported x64-based versions
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| AcRes.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 353,696 |
| Appraiser.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 2,606,464 |
| appraiser.sdb | Not versioned | 18-Oct-25 | 21:42 | 2,808,270 |
| AppraiserRes.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 161,176 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 333,824 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 78,848 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,248 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 92,160 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,232 |
| bootsvc.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 303,112 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 80,896 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,208 |
| compatctrl.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 234,904 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 358,400 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 87,040 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 349,696 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 86,016 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 390,656 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 96,256 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,744 |
| DismApi.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 1,250,688 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 408,064 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 101,376 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,736 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 384,000 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 92,672 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,240 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 83,968 |
| Facilitator.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 1,123,744 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 353,280 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 85,504 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 100,352 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,760 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 389,120 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 97,792 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 72,704 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 13,720 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 89,600 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 380,416 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 388,608 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 93,696 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 14,224 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 243,712 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 58,880 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 13,208 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 230,912 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 56,320 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 13,200 |
| MediaSetupUIMgr.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 1,742,208 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 350,720 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 392,192 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 90,112 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 395,264 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 367,616 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 370,176 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 90,624 |
| ReAgent.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 742,784 |
| AppXDeploymentServer-Replacement.man | Not versioned | 18-Oct-25 | 21:42 | 10,650 |
| Content-Indexing-Common-Replacement.man | Not versioned | 18-Oct-25 | 21:42 | 4,021 |
| FailoverCluster-ClusSvc-Replacement.man | Not versioned | 18-Oct-25 | 21:42 | 2,481 |
| AppxUpgradeMigrationPlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 607,616 |
| ClusterUpgradePlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 107,904 |
| VsmKeyMigPlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 112,000 |
| tcblaunch-replacement.man | Not versioned | 18-Oct-25 | 21:42 | 1,935 |
| Windows-Internal-Shell-AIX-Config-Replacement.man | Not versioned | 18-Oct-25 | 21:42 | 1,552 |
| WindowsSearchEngine-replacement.man | Not versioned | 18-Oct-25 | 21:42 | 6,327 |
| reportgen.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 75,152 |
| ReserveManager.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 345,496 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 367,104 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 88,576 |
| ServicingCommon.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 955,944 |
| setupcompat.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 370,088 |
| SetupCore.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 2,950,552 |
| SetupHost.exe | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 906,664 |
| SetupMgr.dll | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 1,234,328 |
| SetupPlatform.dll | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 9,827,784 |
| SetupPlatform.exe | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 255,360 |
| SetupPrep.exe | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 1,357,200 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 359,424 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 81,408 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 347,648 |
| upgrade_bulk.xml | Not versioned | 18-Oct-25 | 21:42 | 211,949 |
| WinSetupBoot.sys | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 112,040 |
| WinSetupMon.sys | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 169,376 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 187,392 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 45,568 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:42 | 13,216 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:42 | 46,080 |
For all supported ARM64-based versions
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| AcRes.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 343,952 |
| Appraiser.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 2,580,888 |
| appraiser.sdb | Not versioned | 18-Oct-25 | 21:46 | 2,027,911 |
| AppraiserRes.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 150,928 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 333,824 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 78,848 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,232 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 92,160 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,248 |
| bootsvc.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 282,592 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 80,896 |
| compatctrl.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 230,312 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 358,400 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 87,040 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 349,696 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 86,016 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,240 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 390,656 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 96,256 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,744 |
| DismApi.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 2,149,800 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 408,064 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 101,376 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,720 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,208 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 384,000 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 92,672 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 83,968 |
| Facilitator.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,174,912 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 353,280 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 85,504 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 100,352 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 389,120 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 97,792 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 72,704 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 13,696 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 89,600 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 380,416 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 388,608 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 93,696 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 243,712 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 58,880 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 13,184 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 230,912 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 56,320 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 13,200 |
| MediaSetupUIMgr.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,750,416 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 350,720 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 392,192 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 90,112 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 395,264 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 367,616 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 370,176 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 90,624 |
| ReAgent.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,207,680 |
| AppXDeploymentServer-Replacement.man | Not versioned | 18-Oct-25 | 21:46 | 10,650 |
| Content-Indexing-Common-Replacement.man | Not versioned | 18-Oct-25 | 21:46 | 4,021 |
| FailoverCluster-ClusSvc-Replacement.man | Not versioned | 18-Oct-25 | 21:46 | 2,481 |
| AppxUpgradeMigrationPlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 640,384 |
| ClusterUpgradePlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 95,616 |
| VsmKeyMigPlugin.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 102,784 |
| tcblaunch-replacement.man | Not versioned | 18-Oct-25 | 21:46 | 1,935 |
| Windows-Internal-Shell-AIX-Config-Replacement.man | Not versioned | 18-Oct-25 | 21:46 | 1,552 |
| WindowsSearchEngine-replacement.man | Not versioned | 18-Oct-25 | 21:46 | 6,327 |
| reportgen.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 55,184 |
| ReserveManager.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 340,888 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 367,104 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 88,576 |
| ServicingCommon.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,771,224 |
| setupcompat.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 356,776 |
| SetupCore.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 3,005,864 |
| SetupHost.exe | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 908,184 |
| SetupMgr.dll | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,296,296 |
| SetupPlatform.dll | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 10,305,480 |
| SetupPlatform.exe | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 238,992 |
| SetupPrep.exe | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 1,386,368 |
| SetupPlatform.exe.mui | 1.97.26100.7015 | 18-Oct-25 | 21:46 | 14,224 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 359,424 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 81,408 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 347,648 |
| upgrade_bulk.xml | Not versioned | 18-Oct-25 | 21:46 | 211,949 |
| WinSetupBoot.sys | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 91,024 |
| WinSetupMon.sys | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 145,840 |
| AcRes.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 187,392 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 45,568 |
| MediaSetupUIMgr.dll.mui | 10.0.26100.7015 | 18-Oct-25 | 21:46 | 46,080 |
References
Description of the standard terminology that is used to describe Microsoft software updates
Query words: Setup DU