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This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) makes sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
Important Before you install this update, see the Prerequisites section.
This update is available through Windows Update. It will be downloaded and installed automatically.
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
This update is also available through Windows Server Update Services (WSUS).
To install Windows 7 SP1 and Windows Server 2008 R2 SP1 updates released on or after July 2019, you must have the following required updates installed. If you use Windows Update, these required updates will be offered automatically as needed
Important You must restart your device after you install these required updates.
You don't have to restart your computer after you apply this update.
Servicing stack updates (SSUs) make changes to how updates are installed and cannot be uninstalled from the device.
This update replaces the previously released update KB4537829.
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows6.1-KB4550735-x86.msu | 5811DEF508A4D12403ECD1CB4BBB5C9922C792EA | 6810D28B6D22C3798D1AC9FD11157A16BE0EA077C63D0853BC568B7FB301A50C |
| Windows6.1-KB4550735-x64.msu | 18117664B4A0482C3D34A2F05F70C6819296240F | E6C9B068EE05F667073E51BCE8B91BF8585AAF186316690C069AB64F59F3FD28 |
| Windows6.1-KB4550735-ia64.msu | 1336150981B971730612C415C8D16995B6DAA24A | E55569F29A9458C9CD4640CBC7DAB88C7BC30F12453F58CC6FCFE509EAB061A2 |
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
| File name | File version | File size | Date | Time |
| Apds.dll | 6.1.7601.24550 | 1,798,144 | 05-Mar-2020 | 00:44 |
| Apircl.dll | 6.1.7601.24550 | 223,744 | 05-Mar-2020 | 00:44 |
| Apss.dll | 6.1.7601.24550 | 201,216 | 05-Mar-2020 | 00:44 |
| Cbscore.dll | 6.1.7601.24550 | 845,824 | 05-Mar-2020 | 00:42 |
| Cbsmsg.dll | 6.1.7601.24550 | 28,672 | 05-Mar-2020 | 00:10 |
| Cmiadapter.dll | 6.1.7601.24550 | 120,320 | 05-Mar-2020 | 00:42 |
| Cmitrust.dll | 6.1.7601.24550 | 296,960 | 05-Mar-2020 | 00:42 |
| Cmiv2.dll | 6.1.7601.24550 | 2,040,832 | 05-Mar-2020 | 00:42 |
| Cntrtextinstaller.dll | 6.1.7601.24550 | 143,872 | 05-Mar-2020 | 00:42 |
| Dpx.dll | 6.1.7601.24550 | 257,024 | 05-Mar-2020 | 00:42 |
| Drupdate.dll | 6.1.7601.24550 | 174,080 | 05-Mar-2020 | 00:42 |
| Drvstore.dll | 6.1.7601.24550 | 324,096 | 05-Mar-2020 | 00:42 |
| Esscli.dll | 6.1.7601.24550 | 266,240 | 05-Mar-2020 | 00:42 |
| Extendedsecurityupdatesai.dll | 6.1.7601.24550 | 89,088 | 05-Mar-2020 | 00:10 |
| Fastprox.dll | 6.1.7601.24550 | 606,720 | 05-Mar-2020 | 00:42 |
| Globalinstallorder.xml | Not applicable | 1,973,556 | 26-Nov-2019 | 20:21 |
| Helpcins.dll | 6.1.7601.24550 | 105,472 | 05-Mar-2020 | 00:42 |
| Locdrv.dll | 6.1.7601.24550 | 229,888 | 05-Mar-2020 | 00:44 |
| Mofd.dll | 6.1.7601.24550 | 192,000 | 05-Mar-2020 | 00:43 |
| Mofinstall.dll | 6.1.7601.24550 | 58,880 | 05-Mar-2020 | 00:43 |
| Msdelta.dll | 6.1.7601.24550 | 305,664 | 05-Mar-2020 | 00:43 |
| Mspatcha.dll | 6.1.7601.24550 | 35,328 | 05-Mar-2020 | 00:43 |
| Oemhelpins.dll | 6.1.7601.24550 | 151,040 | 05-Mar-2020 | 00:43 |
| Pkgmgr.exe | 6.1.7601.24550 | 209,920 | 05-Mar-2020 | 00:10 |
| Poqexec.exe | 6.1.7601.24550 | 123,904 | 05-Mar-2020 | 00:10 |
| Repdrvfs.dll | 6.1.7601.24550 | 302,080 | 05-Mar-2020 | 00:43 |
| Smiengine.dll | 6.1.7601.24550 | 697,344 | 05-Mar-2020 | 00:44 |
| Smipi.dll | 6.1.7601.24550 | 98,816 | 05-Mar-2020 | 00:44 |
| Svcini.exe | 6.1.7601.24550 | 16,384 | 05-Mar-2020 | 00:10 |
| Wbemcomn.dll | 6.1.7601.24550 | 363,520 | 05-Mar-2020 | 00:44 |
| Wbemcore.dll | 6.1.7601.24550 | 780,288 | 05-Mar-2020 | 00:44 |
| Wbemprox.dll | 6.1.7601.24550 | 29,184 | 05-Mar-2020 | 00:44 |
| Wcmtypes.xsd | Not applicable | 1,047 | 26-Nov-2019 | 21:19 |
| Wcp.dll | 6.1.7601.24550 | 1,913,344 | 05-Mar-2020 | 00:44 |
| Wdscore.dll | 6.1.7601.24550 | 190,464 | 05-Mar-2020 | 00:44 |
| Wmicmiplugin.dll | 6.1.7601.24550 | 351,744 | 05-Mar-2020 | 00:44 |
| Wmiutils.dll | 6.1.7601.24550 | 85,504 | 05-Mar-2020 | 00:44 |
| Wrpint.dll | 6.1.7601.24550 | 54,272 | 05-Mar-2020 | 00:08 |
| Xmllite.dll | 1.3.1001.0 | 180,736 | 05-Mar-2020 | 00:44 |
| File name | File version | File size | Date | Time |
| Apds.dll | 6.1.7601.24550 | 2,172,928 | 05-Mar-2020 | 00:37 |
| Apircl.dll | 6.1.7601.24550 | 276,480 | 05-Mar-2020 | 00:37 |
| Apss.dll | 6.1.7601.24550 | 235,520 | 05-Mar-2020 | 00:37 |
| Cbscore.dll | 6.1.7601.24550 | 976,896 | 05-Mar-2020 | 00:36 |
| Cbsmsg.dll | 6.1.7601.24550 | 28,672 | 05-Mar-2020 | 00:36 |
| Cmiadapter.dll | 6.1.7601.24550 | 125,952 | 05-Mar-2020 | 00:36 |
| Cmitrust.dll | 6.1.7601.24550 | 479,232 | 05-Mar-2020 | 00:36 |
| Cmiv2.dll | 6.1.7601.24550 | 3,739,136 | 05-Mar-2020 | 00:36 |
| Cntrtextinstaller.dll | 6.1.7601.24550 | 170,496 | 05-Mar-2020 | 00:37 |
| Dpx.dll | 6.1.7601.24550 | 399,872 | 05-Mar-2020 | 00:37 |
| Drupdate.dll | 6.1.7601.24550 | 204,288 | 05-Mar-2020 | 00:37 |
| Drvstore.dll | 6.1.7601.24550 | 423,936 | 05-Mar-2020 | 00:37 |
| Esscli.dll | 6.1.7601.24550 | 440,320 | 05-Mar-2020 | 00:37 |
| Extendedsecurityupdatesai.dll | 6.1.7601.24550 | 102,400 | 05-Mar-2020 | 00:02 |
| Fastprox.dll | 6.1.7601.24550 | 909,824 | 05-Mar-2020 | 00:37 |
| Globalinstallorder.xml | Not applicable | 1,973,556 | 18-Nov-2018 | 02:41 |
| Helpcins.dll | 6.1.7601.24550 | 142,336 | 05-Mar-2020 | 00:37 |
| Locdrv.dll | 6.1.7601.24550 | 370,176 | 05-Mar-2020 | 00:37 |
| Mofd.dll | 6.1.7601.24550 | 278,528 | 05-Mar-2020 | 00:37 |
| Mofinstall.dll | 6.1.7601.24550 | 76,288 | 05-Mar-2020 | 00:37 |
| Msdelta.dll | 6.1.7601.24550 | 452,096 | 05-Mar-2020 | 00:37 |
| Mspatcha.dll | 6.1.7601.24550 | 46,592 | 05-Mar-2020 | 00:37 |
| Oemhelpins.dll | 6.1.7601.24550 | 222,208 | 05-Mar-2020 | 00:37 |
| Pkgmgr.exe | 6.1.7601.24550 | 199,168 | 05-Mar-2020 | 00:02 |
| Poqexec.exe | 6.1.7601.24550 | 142,336 | 05-Mar-2020 | 00:02 |
| Repdrvfs.dll | 6.1.7601.24550 | 454,144 | 05-Mar-2020 | 00:37 |
| Smiengine.dll | 6.1.7601.24550 | 933,376 | 05-Mar-2020 | 00:37 |
| Smipi.dll | 6.1.7601.24550 | 104,448 | 05-Mar-2020 | 00:37 |
| Svcini.exe | 6.1.7601.24550 | 17,920 | 05-Mar-2020 | 00:02 |
| Wbemcomn.dll | 6.1.7601.24550 | 529,920 | 05-Mar-2020 | 00:38 |
| Wbemcore.dll | 6.1.7601.24550 | 1,225,216 | 05-Mar-2020 | 00:38 |
| Wbemprox.dll | 6.1.7601.24550 | 43,520 | 05-Mar-2020 | 00:38 |
| Wcmtypes.xsd | Not applicable | 1,047 | 18-Nov-2018 | 02:57 |
| Wcp.dll | 6.1.7601.24550 | 2,762,752 | 05-Mar-2020 | 00:38 |
| Wdscore.dll | 6.1.7601.24550 | 271,872 | 05-Mar-2020 | 00:38 |
| Wmicmiplugin.dll | 6.1.7601.24550 | 525,824 | 05-Mar-2020 | 00:38 |
| Wmiutils.dll | 6.1.7601.24550 | 137,216 | 05-Mar-2020 | 00:38 |
| Wrpint.dll | 6.1.7601.24550 | 60,928 | 05-Mar-2020 | 00:38 |
| Xmllite.dll | 1.3.1001.0 | 198,656 | 05-Mar-2020 | 00:38 |
| Apds.dll | 6.1.7601.24550 | 1,798,144 | 05-Mar-2020 | 00:44 |
| Apircl.dll | 6.1.7601.24550 | 223,744 | 05-Mar-2020 | 00:44 |
| Apss.dll | 6.1.7601.24550 | 201,216 | 05-Mar-2020 | 00:44 |
| Cbscore.dll | 6.1.7601.24550 | 845,824 | 05-Mar-2020 | 00:42 |
| Cbsmsg.dll | 6.1.7601.24550 | 28,672 | 05-Mar-2020 | 00:10 |
| Cmiadapter.dll | 6.1.7601.24550 | 120,320 | 05-Mar-2020 | 00:42 |
| Cmitrust.dll | 6.1.7601.24550 | 296,960 | 05-Mar-2020 | 00:42 |
| Cmiv2.dll | 6.1.7601.24550 | 2,040,832 | 05-Mar-2020 | 00:42 |
| Cntrtextinstaller.dll | 6.1.7601.24550 | 143,872 | 05-Mar-2020 | 00:42 |
| Dpx.dll | 6.1.7601.24550 | 257,024 | 05-Mar-2020 | 00:42 |
| Drupdate.dll | 6.1.7601.24550 | 174,080 | 05-Mar-2020 | 00:42 |
| Drvstore.dll | 6.1.7601.24550 | 324,096 | 05-Mar-2020 | 00:42 |
| Esscli.dll | 6.1.7601.24550 | 266,240 | 05-Mar-2020 | 00:42 |
| Extendedsecurityupdatesai.dll | 6.1.7601.24550 | 89,088 | 05-Mar-2020 | 00:10 |
| Fastprox.dll | 6.1.7601.24550 | 606,720 | 05-Mar-2020 | 00:42 |
| Globalinstallorder.xml | Not applicable | 1,973,556 | 26-Nov-2019 | 20:21 |
| Helpcins.dll | 6.1.7601.24550 | 105,472 | 05-Mar-2020 | 00:42 |
| Locdrv.dll | 6.1.7601.24550 | 229,888 | 05-Mar-2020 | 00:44 |
| Mofd.dll | 6.1.7601.24550 | 192,000 | 05-Mar-2020 | 00:43 |
| Mofinstall.dll | 6.1.7601.24550 | 58,880 | 05-Mar-2020 | 00:43 |
| Msdelta.dll | 6.1.7601.24550 | 305,664 | 05-Mar-2020 | 00:43 |
| Mspatcha.dll | 6.1.7601.24550 | 35,328 | 05-Mar-2020 | 00:43 |
| Oemhelpins.dll | 6.1.7601.24550 | 151,040 | 05-Mar-2020 | 00:43 |
| Pkgmgr.exe | 6.1.7601.24550 | 209,920 | 05-Mar-2020 | 00:10 |
| Poqexec.exe | 6.1.7601.24550 | 123,904 | 05-Mar-2020 | 00:10 |
| Repdrvfs.dll | 6.1.7601.24550 | 302,080 | 05-Mar-2020 | 00:43 |
| Smiengine.dll | 6.1.7601.24550 | 697,344 | 05-Mar-2020 | 00:44 |
| Smipi.dll | 6.1.7601.24550 | 98,816 | 05-Mar-2020 | 00:44 |
| Svcini.exe | 6.1.7601.24550 | 16,384 | 05-Mar-2020 | 00:10 |
| Wbemcomn.dll | 6.1.7601.24550 | 363,520 | 05-Mar-2020 | 00:44 |
| Wbemcore.dll | 6.1.7601.24550 | 780,288 | 05-Mar-2020 | 00:44 |
| Wbemprox.dll | 6.1.7601.24550 | 29,184 | 05-Mar-2020 | 00:44 |
| Wcmtypes.xsd | Not applicable | 1,047 | 26-Nov-2019 | 21:19 |
| Wcp.dll | 6.1.7601.24550 | 1,913,344 | 05-Mar-2020 | 00:44 |
| Wdscore.dll | 6.1.7601.24550 | 190,464 | 05-Mar-2020 | 00:44 |
| Wmicmiplugin.dll | 6.1.7601.24550 | 351,744 | 05-Mar-2020 | 00:44 |
| Wmiutils.dll | 6.1.7601.24550 | 85,504 | 05-Mar-2020 | 00:44 |
| Wrpint.dll | 6.1.7601.24550 | 54,272 | 05-Mar-2020 | 00:08 |
| Xmllite.dll | 1.3.1001.0 | 180,736 | 05-Mar-2020 | 00:44 |
| File name | File version | File size | Date | Time |
| Apds.dll | 6.1.7601.24550 | 3,342,336 | 05-Mar-2020 | 00:22 |
| Apircl.dll | 6.1.7601.24550 | 752,128 | 05-Mar-2020 | 00:22 |
| Apss.dll | 6.1.7601.24550 | 560,128 | 05-Mar-2020 | 00:22 |
| Cbscore.dll | 6.1.7601.24550 | 1,837,056 | 05-Mar-2020 | 00:21 |
| Cbsmsg.dll | 6.1.7601.24550 | 40,448 | 05-Mar-2020 | 00:21 |
| Cmiadapter.dll | 6.1.7601.24550 | 284,672 | 05-Mar-2020 | 00:21 |
| Cmitrust.dll | 6.1.7601.24550 | 987,136 | 05-Mar-2020 | 00:21 |
| Cmiv2.dll | 6.1.7601.24550 | 6,536,192 | 05-Mar-2020 | 00:21 |
| Cntrtextinstaller.dll | 6.1.7601.24550 | 357,376 | 05-Mar-2020 | 00:21 |
| Dpx.dll | 6.1.7601.24550 | 770,560 | 05-Mar-2020 | 00:21 |
| Drupdate.dll | 6.1.7601.24550 | 390,656 | 05-Mar-2020 | 00:21 |
| Drvstore.dll | 6.1.7601.24550 | 742,912 | 05-Mar-2020 | 00:21 |
| Esscli.dll | 6.1.7601.24550 | 1,011,200 | 05-Mar-2020 | 00:21 |
| Extendedsecurityupdatesai.dll | 6.1.7601.24550 | 216,064 | 04-Mar-2020 | 23:55 |
| Fastprox.dll | 6.1.7601.24550 | 2,100,224 | 05-Mar-2020 | 00:21 |
| Globalinstallorder.xml | Not applicable | 1,973,556 | 18-Nov-2018 | 02:41 |
| Helpcins.dll | 6.1.7601.24550 | 187,904 | 05-Mar-2020 | 00:21 |
| Locdrv.dll | 6.1.7601.24550 | 803,328 | 05-Mar-2020 | 00:22 |
| Mofd.dll | 6.1.7601.24550 | 643,584 | 05-Mar-2020 | 00:22 |
| Mofinstall.dll | 6.1.7601.24550 | 193,024 | 05-Mar-2020 | 00:22 |
| Msdelta.dll | 6.1.7601.24550 | 890,880 | 05-Mar-2020 | 00:22 |
| Mspatcha.dll | 6.1.7601.24550 | 111,104 | 05-Mar-2020 | 00:22 |
| Oemhelpins.dll | 6.1.7601.24550 | 420,352 | 05-Mar-2020 | 00:22 |
| Pkgmgr.exe | 6.1.7601.24550 | 334,848 | 04-Mar-2020 | 23:56 |
| Poqexec.exe | 6.1.7601.24550 | 272,384 | 04-Mar-2020 | 23:55 |
| Repdrvfs.dll | 6.1.7601.24550 | 1,067,520 | 05-Mar-2020 | 00:22 |
| Smiengine.dll | 6.1.7601.24550 | 1,953,792 | 05-Mar-2020 | 00:22 |
| Smipi.dll | 6.1.7601.24550 | 186,880 | 05-Mar-2020 | 00:22 |
| Svcini.exe | 6.1.7601.24550 | 41,984 | 04-Mar-2020 | 23:55 |
| Wbemcomn.dll | 6.1.7601.24550 | 1,005,056 | 05-Mar-2020 | 00:22 |
| Wbemcore.dll | 6.1.7601.24550 | 2,959,872 | 05-Mar-2020 | 00:22 |
| Wbemprox.dll | 6.1.7601.24550 | 102,912 | 05-Mar-2020 | 00:22 |
| Wcmtypes.xsd | Not applicable | 1,047 | 18-Nov-2018 | 02:59 |
| Wcp.dll | 6.1.7601.24550 | 5,137,408 | 05-Mar-2020 | 00:22 |
| Wdscore.dll | 6.1.7601.24550 | 600,576 | 05-Mar-2020 | 00:22 |
| Wmicmiplugin.dll | 6.1.7601.24550 | 940,544 | 05-Mar-2020 | 00:22 |
| Wmiutils.dll | 6.1.7601.24550 | 273,408 | 05-Mar-2020 | 00:22 |
| Wrpint.dll | 6.1.7601.24550 | 128,000 | 05-Mar-2020 | 00:22 |
| Xmllite.dll | 1.3.1001.0 | 449,024 | 05-Mar-2020 | 00:22 |
| Apds.dll | 6.1.7601.24550 | 1,798,144 | 05-Mar-2020 | 00:44 |
| Apircl.dll | 6.1.7601.24550 | 223,744 | 05-Mar-2020 | 00:44 |
| Apss.dll | 6.1.7601.24550 | 201,216 | 05-Mar-2020 | 00:44 |
| Cbscore.dll | 6.1.7601.24550 | 845,824 | 05-Mar-2020 | 00:42 |
| Cbsmsg.dll | 6.1.7601.24550 | 28,672 | 05-Mar-2020 | 00:10 |
| Cmiadapter.dll | 6.1.7601.24550 | 120,320 | 05-Mar-2020 | 00:42 |
| Cmitrust.dll | 6.1.7601.24550 | 296,960 | 05-Mar-2020 | 00:42 |
| Cmiv2.dll | 6.1.7601.24550 | 2,040,832 | 05-Mar-2020 | 00:42 |
| Cntrtextinstaller.dll | 6.1.7601.24550 | 143,872 | 05-Mar-2020 | 00:42 |
| Dpx.dll | 6.1.7601.24550 | 257,024 | 05-Mar-2020 | 00:42 |
| Drupdate.dll | 6.1.7601.24550 | 174,080 | 05-Mar-2020 | 00:42 |
| Drvstore.dll | 6.1.7601.24550 | 324,096 | 05-Mar-2020 | 00:42 |
| Esscli.dll | 6.1.7601.24550 | 266,240 | 05-Mar-2020 | 00:42 |
| Extendedsecurityupdatesai.dll | 6.1.7601.24550 | 89,088 | 05-Mar-2020 | 00:10 |
| Fastprox.dll | 6.1.7601.24550 | 606,720 | 05-Mar-2020 | 00:42 |
| Globalinstallorder.xml | Not applicable | 1,973,556 | 26-Nov-2019 | 20:21 |
| Helpcins.dll | 6.1.7601.24550 | 105,472 | 05-Mar-2020 | 00:42 |
| Locdrv.dll | 6.1.7601.24550 | 229,888 | 05-Mar-2020 | 00:44 |
| Mofd.dll | 6.1.7601.24550 | 192,000 | 05-Mar-2020 | 00:43 |
| Mofinstall.dll | 6.1.7601.24550 | 58,880 | 05-Mar-2020 | 00:43 |
| Msdelta.dll | 6.1.7601.24550 | 305,664 | 05-Mar-2020 | 00:43 |
| Mspatcha.dll | 6.1.7601.24550 | 35,328 | 05-Mar-2020 | 00:43 |
| Oemhelpins.dll | 6.1.7601.24550 | 151,040 | 05-Mar-2020 | 00:43 |
| Pkgmgr.exe | 6.1.7601.24550 | 209,920 | 05-Mar-2020 | 00:10 |
| Poqexec.exe | 6.1.7601.24550 | 123,904 | 05-Mar-2020 | 00:10 |
| Repdrvfs.dll | 6.1.7601.24550 | 302,080 | 05-Mar-2020 | 00:43 |
| Smiengine.dll | 6.1.7601.24550 | 697,344 | 05-Mar-2020 | 00:44 |
| Smipi.dll | 6.1.7601.24550 | 98,816 | 05-Mar-2020 | 00:44 |
| Svcini.exe | 6.1.7601.24550 | 16,384 | 05-Mar-2020 | 00:10 |
| Wbemcomn.dll | 6.1.7601.24550 | 363,520 | 05-Mar-2020 | 00:44 |
| Wbemcore.dll | 6.1.7601.24550 | 780,288 | 05-Mar-2020 | 00:44 |
| Wbemprox.dll | 6.1.7601.24550 | 29,184 | 05-Mar-2020 | 00:44 |
| Wcmtypes.xsd | Not applicable | 1,047 | 26-Nov-2019 | 21:19 |
| Wcp.dll | 6.1.7601.24550 | 1,913,344 | 05-Mar-2020 | 00:44 |
| Wdscore.dll | 6.1.7601.24550 | 190,464 | 05-Mar-2020 | 00:44 |
| Wmicmiplugin.dll | 6.1.7601.24550 | 351,744 | 05-Mar-2020 | 00:44 |
| Wmiutils.dll | 6.1.7601.24550 | 85,504 | 05-Mar-2020 | 00:44 |
| Wrpint.dll | 6.1.7601.24550 | 54,272 | 05-Mar-2020 | 00:08 |
| Xmllite.dll | 1.3.1001.0 | 180,736 | 05-Mar-2020 | 00:44 |
For information on SSUs, see the following articles:
Learn about the terminology that Microsoft uses to describe software updates.
Keywords: ssu for windows 7, ssu for windows server 2008 R2, windows server 2008 R2 SP1 update, windows 7 update, kbSupportTopic, kbContentAuto