KB5066584: Servicing stack update for Windows 10, version 1607 and Windows Server 2016: October 14, 2025

Applies To
Windows 10, version 1607, all editions Windows Server 2016

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.

End of support information

Note

  • Support for Windows 10 has ended on October 14, 2025
  • After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11.
  • Learn more

Summary

This servicing stack update (SSU) makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates make sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

Important Not installing the latest SSU before applying Windows updates might result in the Windows update not being offered until the latest SSU is installed.

How to get this update

Install this update

To install this update, use one of the following release channels.


Available Next step
Available 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 don't have to restart your computer after you apply this update.
Removal information Servicing stack updates (SSUs) make changes to how updates are installed and cannot be uninstalled from the device.
Update replacement information This update replaces the previously released update KB5065687.

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 x86-based versions
File name File version Date Time File size
luainstall.dll 10.0.14393.8508 19-Sep-25 10:52 52,672
appxreg.dll 10.0.14393.8508 19-Sep-25 10:52 37,848
appxprovisionpackage.dll 10.0.14393.8508 19-Sep-25 10:52 78,824
EventsInstaller.dll 10.0.14393.8508 19-Sep-25 10:52 178,136
CntrtextInstaller.dll 10.0.14393.8508 19-Sep-25 10:52 141,288
grouptrusteeai.dll 10.0.14393.8508 19-Sep-25 10:52 39,896
sppinst.dll 10.0.14393.8508 19-Sep-25 10:52 38,336
timezoneai.dll 10.0.14393.8508 19-Sep-25 10:52 60,864
httpai.dll 10.0.14393.8508 19-Sep-25 10:52 29,136
cmifw.dll 10.0.14393.8508 19-Sep-25 10:52 91,600
FirewallOfflineAPI.dll 10.0.14393.8508 19-Sep-25 10:52 162,768
NetSetupAI.dll 10.0.14393.8508 19-Sep-25 10:52 105,432
NetSetupApi.dll 10.0.14393.8508 19-Sep-25 10:52 113,112
NetSetupEngine.dll 10.0.14393.8508 19-Sep-25 10:52 607,704
ImplatSetup.dll 10.0.14393.8508 19-Sep-25 10:52 102,360
winsockai.dll 10.0.14393.8508 19-Sep-25 10:52 74,688
ws2_helper.dll 10.0.14393.8508 19-Sep-25 10:52 79,824
wmicmiplugin.dll 10.0.14393.8508 19-Sep-25 10:52 274,384
offlinelsa.dll 10.0.14393.8508 19-Sep-25 10:52 112,104
offlinesam.dll 10.0.14393.8508 19-Sep-25 10:52 235,480
poqexec.exe.mui 10.0.14393.8508 19-Sep-25 10:52 3,072
mofinstall.dll 10.0.14393.8508 19-Sep-25 10:52 73,664
esscli.dll 10.0.14393.8508 19-Sep-25 10:52 300,992
mofd.dll 10.0.14393.8508 19-Sep-25 10:52 208,832
repdrvfs.dll 10.0.14393.8508 19-Sep-25 10:52 283,600
fastprox.dll 10.0.14393.8508 19-Sep-25 10:52 671,192
wbemcomn.dll 10.0.14393.8508 19-Sep-25 10:52 389,592
wbemcore.dll 10.0.14393.8508 19-Sep-25 10:52 985,560
wmiutils.dll 10.0.14393.8508 19-Sep-25 10:52 99,816
wbemprox.dll 10.0.14393.8508 19-Sep-25 10:52 37,824
shtransform.dll 10.0.14393.8508 19-Sep-25 10:52 34,264
bfsvc.dll 10.0.14393.8508 19-Sep-25 10:52 178,112
securebootai.dll 10.0.14393.8508 19-Sep-25 10:52 297,432
fveupdateai.dll 10.0.14393.8508 19-Sep-25 10:52 29,120
cmitrust.dll 10.0.14393.8508 19-Sep-25 10:52 276,952
peerdistai.dll 10.0.14393.8508 19-Sep-25 10:52 33,768
PrintAdvancedInstaller.dll 10.0.14393.8508 19-Sep-25 10:52 94,696
msdtcadvancedinstaller.dll 10.0.14393.8508 19-Sep-25 10:52 56,272
netfxconfig.dll 10.0.14393.8508 19-Sep-25 10:52 28,648
ConfigureIEOptionalComponentsAI.dll 10.0.14393.8508 19-Sep-25 10:52 48,088
IEFileInstallAI.dll 10.0.14393.8508 19-Sep-25 10:52 36,824
servicemodelregai.dll 10.0.14393.8508 19-Sep-25 10:52 74,200
SetIEInstalledDateAI.dll 10.0.14393.8508 19-Sep-25 10:52 24,000
bcdeditai.dll 10.0.14393.8508 19-Sep-25 10:52 273,360
FeatureSettingsOverride.dll 10.0.14393.8508 19-Sep-25 10:52 35,776
SupplementalServicingAI.dll 10.0.14393.8508 19-Sep-25 10:52 17,920
PrimitiveTransformers.dll 10.0.14393.8508 19-Sep-25 10:52 52,696
AriTransformer.dll 10.0.14393.8508 19-Sep-25 10:52 51,176
WpnDataTransformer.dll 10.0.14393.8508 19-Sep-25 10:52 31,680
mqcmiplugin.dll 5.0.1.1 19-Sep-25 10:52 132,048
wdscore.dll 10.0.14393.8508 19-Sep-25 10:52 221,120
drvstore.dll 10.0.14393.8508 19-Sep-25 10:52 751,552
dpx.dll 5.0.1.1 19-Sep-25 10:52 382,400
msdelta.dll 5.0.1.1 19-Sep-25 10:52 408,000
mspatcha.dll 5.0.1.1 19-Sep-25 10:52 46,040
cmiaisupport.dll 10.0.14393.8508 19-Sep-25 10:52 1,915,352
WcmTypes.xsd Not versioned 19-Sep-25 10:52 1,047
CbsMsg.dll 10.0.14393.8508 19-Sep-25 10:52 50,640
CbsCore.dll 10.0.14393.8508 19-Sep-25 10:52 1,791,936
TiWorker.exe 10.0.14393.8508 19-Sep-25 10:52 197,120
TiFileFetcher.exe 10.0.14393.8508 19-Sep-25 10:52 247,744
drupdate.dll 10.0.14393.8508 19-Sep-25 10:52 287,192
wcp.dll 10.0.14393.8508 19-Sep-25 10:52 2,738,624
cmiadapter.dll 10.0.14393.8508 19-Sep-25 10:52 74,200
smiengine.dll 10.0.14393.8508 19-Sep-25 10:52 748,480
smipi.dll 10.0.14393.8508 19-Sep-25 10:52 33,240
poqexec.exe 10.0.14393.8508 19-Sep-25 10:52 120,320
x86_installed Not versioned 19-Sep-25 10:52 9
GlobalInstallOrder.xml Not versioned 19-Sep-25 10:52 1,247,706
wrpint.dll 10.0.14393.8508 19-Sep-25 10:52 68,056
iissetupai.dll 10.0.14393.8508 19-Sep-25 10:52 99,792
cleanupai.dll 10.0.14393.8508 19-Sep-25 10:52 23,000
For all supported x64-based versions
File name File version Date Time File size
luainstall.dll 10.0.14393.8508 19-Sep-25 11:04 61,376
appxreg.dll 10.0.14393.8508 19-Sep-25 11:04 43,992
appxprovisionpackage.dll 10.0.14393.8508 19-Sep-25 11:04 88,040
EventsInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 223,680
CntrtextInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 164,288
grouptrusteeai.dll 10.0.14393.8508 19-Sep-25 11:04 45,016
sppinst.dll 10.0.14393.8508 19-Sep-25 11:04 43,472
timezoneai.dll 10.0.14393.8508 19-Sep-25 11:04 71,616
httpai.dll 10.0.14393.8508 19-Sep-25 11:04 32,208
cmifw.dll 10.0.14393.8508 19-Sep-25 11:04 102,888
FirewallOfflineAPI.dll 10.0.14393.8508 19-Sep-25 11:04 185,792
NetSetupAI.dll 10.0.14393.8508 19-Sep-25 11:04 133,584
NetSetupApi.dll 10.0.14393.8508 19-Sep-25 11:04 149,952
NetSetupEngine.dll 10.0.14393.8508 19-Sep-25 11:04 859,584
ImplatSetup.dll 10.0.14393.8508 19-Sep-25 11:04 137,176
winsockai.dll 10.0.14393.8508 19-Sep-25 11:04 83,408
ws2_helper.dll 10.0.14393.8508 19-Sep-25 11:04 95,704
wmicmiplugin.dll 10.0.14393.8508 19-Sep-25 11:04 395,712
offlinelsa.dll 10.0.14393.8508 19-Sep-25 11:04 124,368
offlinesam.dll 10.0.14393.8508 19-Sep-25 11:04 262,120
poqexec.exe.mui 10.0.14393.8508 19-Sep-25 11:04 3,072
mofinstall.dll 10.0.14393.8508 19-Sep-25 11:04 74,728
esscli.dll 10.0.14393.8508 19-Sep-25 11:04 398,808
mofd.dll 10.0.14393.8508 19-Sep-25 11:04 247,256
repdrvfs.dll 10.0.14393.8508 19-Sep-25 11:04 353,752
fastprox.dll 10.0.14393.8508 19-Sep-25 11:04 856,536
wbemcomn.dll 10.0.14393.8508 19-Sep-25 11:04 453,056
wbemcore.dll 10.0.14393.8508 19-Sep-25 11:04 1,230,800
wmiutils.dll 10.0.14393.8508 19-Sep-25 11:04 120,280
wbemprox.dll 10.0.14393.8508 19-Sep-25 11:04 43,992
shtransform.dll 10.0.14393.8508 19-Sep-25 11:04 39,872
bfsvc.dll 10.0.14393.8508 19-Sep-25 11:04 206,296
securebootai.dll 10.0.14393.8508 19-Sep-25 11:04 345,536
fveupdateai.dll 10.0.14393.8508 19-Sep-25 11:04 33,728
cmitrust.dll 10.0.14393.8508 19-Sep-25 11:04 401,368
peerdistai.dll 10.0.14393.8508 19-Sep-25 11:04 39,400
PrintAdvancedInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 103,896
msdtcadvancedinstaller.dll 10.0.14393.8508 19-Sep-25 11:04 65,984
netfxconfig.dll 10.0.14393.8508 19-Sep-25 11:04 31,704
ConfigureIEOptionalComponentsAI.dll 10.0.14393.8508 19-Sep-25 11:04 54,720
IEFileInstallAI.dll 10.0.14393.8508 19-Sep-25 11:04 38,336
servicemodelregai.dll 10.0.14393.8508 19-Sep-25 11:04 89,536
SetIEInstalledDateAI.dll 10.0.14393.8508 19-Sep-25 11:04 25,552
bcdeditai.dll 10.0.14393.8508 19-Sep-25 11:04 297,408
FeatureSettingsOverride.dll 10.0.14393.8508 19-Sep-25 11:04 41,432
SupplementalServicingAI.dll 10.0.14393.8508 19-Sep-25 11:04 18,432
PrimitiveTransformers.dll 10.0.14393.8508 19-Sep-25 11:04 67,008
AriTransformer.dll 10.0.14393.8508 19-Sep-25 11:04 57,816
WpnDataTransformer.dll 10.0.14393.8508 19-Sep-25 11:04 38,360
mqcmiplugin.dll 5.0.1.1 19-Sep-25 11:04 155,608
appserverai.dll 10.0.14393.8508 19-Sep-25 11:04 115,176
RDWebAI.dll 10.0.14393.8508 19-Sep-25 11:04 120,792
tssdisai.dll 10.0.14393.8508 19-Sep-25 11:04 122,840
VmHostAI.dll 10.0.14393.8508 19-Sep-25 11:04 101,312
wdscore.dll 10.0.14393.8508 19-Sep-25 11:04 268,248
drvstore.dll 10.0.14393.8508 19-Sep-25 11:04 909,776
dpx.dll 5.0.1.1 19-Sep-25 11:04 508,864
msdelta.dll 5.0.1.1 19-Sep-25 11:04 516,056
mspatcha.dll 5.0.1.1 19-Sep-25 11:04 55,232
cmiaisupport.dll 10.0.14393.8508 19-Sep-25 11:04 2,925,016
WcmTypes.xsd Not versioned 19-Sep-25 11:04 1,047
CbsMsg.dll 10.0.14393.8508 19-Sep-25 11:04 51,664
CbsCore.dll 10.0.14393.8508 19-Sep-25 11:04 2,042,832
TiWorker.exe 10.0.14393.8508 19-Sep-25 11:04 199,680
TiFileFetcher.exe 10.0.14393.8508 19-Sep-25 11:04 290,256
drupdate.dll 10.0.14393.8508 19-Sep-25 11:04 337,384
wcp.dll 10.0.14393.8508 19-Sep-25 11:04 3,202,520
cmiadapter.dll 10.0.14393.8508 19-Sep-25 11:04 85,976
smiengine.dll 10.0.14393.8508 19-Sep-25 11:04 865,744
smipi.dll 10.0.14393.8508 19-Sep-25 11:04 37,864
poqexec.exe 10.0.14393.8508 19-Sep-25 11:04 142,848
amd64_installed Not versioned 19-Sep-25 11:04 9
GlobalInstallOrder.xml Not versioned 19-Sep-25 11:04 1,247,706
wrpint.dll 10.0.14393.8508 19-Sep-25 11:04 77,784
iissetupai.dll 10.0.14393.8508 19-Sep-25 11:04 123,856
cleanupai.dll 10.0.14393.8508 19-Sep-25 11:04 25,024
luainstall.dll 10.0.14393.8508 19-Sep-25 11:04 52,672
appxreg.dll 10.0.14393.8508 19-Sep-25 11:04 37,848
appxprovisionpackage.dll 10.0.14393.8508 19-Sep-25 11:04 78,824
EventsInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 178,136
CntrtextInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 141,288
grouptrusteeai.dll 10.0.14393.8508 19-Sep-25 11:04 39,896
sppinst.dll 10.0.14393.8508 19-Sep-25 11:04 38,336
timezoneai.dll 10.0.14393.8508 19-Sep-25 11:04 60,864
httpai.dll 10.0.14393.8508 19-Sep-25 11:04 29,136
cmifw.dll 10.0.14393.8508 19-Sep-25 11:04 91,600
FirewallOfflineAPI.dll 10.0.14393.8508 19-Sep-25 11:04 162,768
NetSetupAI.dll 10.0.14393.8508 19-Sep-25 11:04 105,432
NetSetupApi.dll 10.0.14393.8508 19-Sep-25 11:04 113,112
NetSetupEngine.dll 10.0.14393.8508 19-Sep-25 11:04 607,704
ImplatSetup.dll 10.0.14393.8508 19-Sep-25 11:04 102,360
winsockai.dll 10.0.14393.8508 19-Sep-25 11:04 74,688
ws2_helper.dll 10.0.14393.8508 19-Sep-25 11:04 79,824
wmicmiplugin.dll 10.0.14393.8508 19-Sep-25 11:04 274,384
mofinstall.dll 10.0.14393.8508 19-Sep-25 11:04 73,664
esscli.dll 10.0.14393.8508 19-Sep-25 11:04 300,992
mofd.dll 10.0.14393.8508 19-Sep-25 11:04 208,832
repdrvfs.dll 10.0.14393.8508 19-Sep-25 11:04 283,600
fastprox.dll 10.0.14393.8508 19-Sep-25 11:04 671,192
wbemcomn.dll 10.0.14393.8508 19-Sep-25 11:04 389,592
wbemcore.dll 10.0.14393.8508 19-Sep-25 11:04 985,560
wmiutils.dll 10.0.14393.8508 19-Sep-25 11:04 99,816
wbemprox.dll 10.0.14393.8508 19-Sep-25 11:04 37,824
shtransform.dll 10.0.14393.8508 19-Sep-25 11:04 34,264
bfsvc.dll 10.0.14393.8508 19-Sep-25 11:04 178,112
securebootai.dll 10.0.14393.8508 19-Sep-25 11:04 297,432
fveupdateai.dll 10.0.14393.8508 19-Sep-25 11:04 29,120
cmitrust.dll 10.0.14393.8508 19-Sep-25 11:04 276,952
peerdistai.dll 10.0.14393.8508 19-Sep-25 11:04 33,768
PrintAdvancedInstaller.dll 10.0.14393.8508 19-Sep-25 11:04 94,696
msdtcadvancedinstaller.dll 10.0.14393.8508 19-Sep-25 11:04 56,272
netfxconfig.dll 10.0.14393.8508 19-Sep-25 11:04 28,648
ConfigureIEOptionalComponentsAI.dll 10.0.14393.8508 19-Sep-25 11:04 48,088
IEFileInstallAI.dll 10.0.14393.8508 19-Sep-25 11:04 36,824
servicemodelregai.dll 10.0.14393.8508 19-Sep-25 11:04 74,200
SetIEInstalledDateAI.dll 10.0.14393.8508 19-Sep-25 11:04 24,000
bcdeditai.dll 10.0.14393.8508 19-Sep-25 11:04 273,360
FeatureSettingsOverride.dll 10.0.14393.8508 19-Sep-25 11:04 35,776
SupplementalServicingAI.dll 10.0.14393.8508 19-Sep-25 11:04 17,920
PrimitiveTransformers.dll 10.0.14393.8508 19-Sep-25 11:04 52,696
AriTransformer.dll 10.0.14393.8508 19-Sep-25 11:04 51,176
WpnDataTransformer.dll 10.0.14393.8508 19-Sep-25 11:04 31,680
appserverai.dll 10.0.14393.8508 19-Sep-25 11:04 94,672
RDWebAI.dll 10.0.14393.8508 19-Sep-25 11:04 104,896
tssdisai.dll 10.0.14393.8508 19-Sep-25 11:04 103,384
VmHostAI.dll 10.0.14393.8508 19-Sep-25 11:04 84,416
wdscore.dll 10.0.14393.8508 19-Sep-25 11:04 221,120
drvstore.dll 10.0.14393.8508 19-Sep-25 11:04 751,552
dpx.dll 5.0.1.1 19-Sep-25 11:04 382,400
msdelta.dll 5.0.1.1 19-Sep-25 11:04 408,000
mspatcha.dll 5.0.1.1 19-Sep-25 11:04 46,040
cmiaisupport.dll 10.0.14393.8508 19-Sep-25 11:04 1,915,352
CbsMsg.dll 10.0.14393.8508 19-Sep-25 11:04 50,640
CbsCore.dll 10.0.14393.8508 19-Sep-25 11:04 1,791,936
TiWorker.exe 10.0.14393.8508 19-Sep-25 11:04 197,120
TiFileFetcher.exe 10.0.14393.8508 19-Sep-25 11:04 247,744
drupdate.dll 10.0.14393.8508 19-Sep-25 11:04 287,192
wcp.dll 10.0.14393.8508 19-Sep-25 11:04 2,738,624
cmiadapter.dll 10.0.14393.8508 19-Sep-25 11:04 74,200
smiengine.dll 10.0.14393.8508 19-Sep-25 11:04 748,480
smipi.dll 10.0.14393.8508 19-Sep-25 11:04 33,240
poqexec.exe 10.0.14393.8508 19-Sep-25 11:04 120,320
x86_installed Not versioned 19-Sep-25 11:04 9
wrpint.dll 10.0.14393.8508 19-Sep-25 11:04 68,056
cleanupai.dll 10.0.14393.8508 19-Sep-25 11:04 23,000

References

Servicing stack updates

Servicing Stack Updates (SSU): Frequently Asked Questions

ADV990001 | Latest Servicing Stack Updates

The benefits of Windows 10 Dynamic Update

Updating Windows 10 media with Dynamic Update packages

Description of the standard terminology that is used to describe Microsoft software updates