SXS_ASSEMBLY_MISSING

[Hydrophile]

I have repeatedly failed to install the LCU for months on my Windows Server 2019 box. An excerpt (below) from my CBS log file suggests I need to install KB5010351, but I cannot find it anywhere (apparently no longer offered on the Microsoft Update Catalog):

CBS:
----------
2025-03-06 08:30:50, Error CSI 0000000e (F) STATUS_SXS_ASSEMBLY_MISSING #1784954# from CCSDirectTransaction::OperateEnding at index 0 of 1 operations, disposition 2[gle=0xd015000c]

2025-03-06 08:30:50, Error CSI 0000000f (F) HRESULT_FROM_WIN32(ERROR_SXS_ASSEMBLY_MISSING) #1784796# from Windows::ServicingAPI::CCSITransaction::ICSITransaction_PinDeployment(Flags = 0, a = 21e309a5b482a8940412720d5368229d, version 10.0.17763.1971, arch amd64, nonSxS, pkt {l:8 b:31bf3856ad364e35}, cb = (null), s = (null), rid = 'Package_351_for_KB5010351~31bf3856ad364e35~amd64~~10.0.1.7.5010351-763_neutral', rah = '2', manpath = (null), catpath = (null), ed = 0, disp = 0)[gle=0x80073701]

2025-03-06 08:30:50, Info CBS Failed to pin deployment while resolving Update: Package_351_for_KB5010351~31bf3856ad364e35~amd64~~10.0.1.7.5010351-763_neutral from file: (null) [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]

2025-03-06 08:30:50, Info CBS Failed to bulk stage deployment manifest and pin deployment for package: Package-E609AE9C4B9F064F63B9F82C6C41015EB78B0025FBB071A753EAB008DC08CBDB~31bf3856ad364e35~amd64~~10.0.17763.6893 [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
----------

Any suggestions? I have read and seen a lot about this issue and have tried the usual fixes (SFC and DISM commands all find no issues). Nothing seems to resolve my situation. I found the KB available for download for Windows 10, but am guessing that would create havoc on my 2019 server OS.

 

[Windows Update Bot]

Hi @Hydrophile,

Welcome to Sysnative Forums!

If you haven't already, please review the posting instructions here, and attach the requested log files. Without log files, our helpers will not be able to assist, and this will slow down fixing your machine.

If logs have been already been provided, our team of volunteers will analyse the provided log files to build a fix for your system. Please be aware that this may take several days from your initial post, due to the high volume of threads that we receive.


- Sysnative Windows Update Team

 

[Maxstar]

Hi and welcome to Sysnative,

Upload a copy of the CBS folder

• Open Windows Explorer and browse to the C:\Windows\Logs folder.
• Right-click on the CBS folder and choose Send to > Compressed (zipped) folder.
• Now the message will appear, "Windows cannot create the Compressed (zipped) Folder here. Do you want it to be placed on the desktop instead?"
• Click on the Yes button here.

• Attach the file CBS.zip to your next reply. If the file is too large to attach, upload the CBS.zip file to www.wetransfer.com and post the link in your next reply.

 

[Hydrophile]

I flushed the CBS and attempted to install the 2025-03 LCU. It failed as expected and the CBS contains the error, referring to KB5010351.

Thank you for your assistance. It is a persistent and lingering problem. No LCU has been installed for many months (but other security updates have been successful).

 

[Maxstar]

Hi,

Follow these instructions to remove an update.

• Open the Start menu of Windows and type the command CMD
• When you see Command Prompt on the list, right-click on it and select Run as administrator.
• When command prompt opens, copy and paste the following command into it, then press enter.

wusa /uninstall /KB:5010351

• Let me know if it says it was successful or you get the message: The update KB5010351 is not installed on this computer.

 

[Hydrophile]

See screenshot -- KB is "required ... and cannot be uninstalled."

 

[Maxstar]

Follow these instructions to install an update with DISM.

• Open the Start menu of Windows and type CMD.
• When you see Command Prompt on the list, select the option Run as administrator.
• Copy and paste the following command into it, and press enter. (Leave the CMD window open!)

MD C:\WUTemp

• Now, download the following update (KB5010351) to: C:\WUTemp - Or copy this file from the download directory to C:\WUTemp. (Important!)
  Downloadlink: KB5010351

• Copy and paste the following commands one at a time into the command prompt and press enter after each.

CD C:\WUTemp
EXPAND.exe windows10.0-kb5010351-x64_f7ba53f4c410299fc28400f7a21b7f616f635a7c.msu -f:* C:\WUTemp
DISM.exe /Online /Add-Package /PackagePath:C:\WUtemp\Windows10.0-KB5010351-x64.cab

• Let me know if it says it was successful or if there are any errors. Or take a screenshot of the command prompt window and paste it into your next reply.