Microsoft XML Core Services 4.0 sp2 kb936181 always prompts installation, but I also encountered this problem)

In August 14, I made several updates, but this kb936181 always appeared repeatedly. After the installation, I asked to restart the computer. I have installed it dozens of times, you can install it again after each restart. What is the problem?

Then I found a solution.

Control Panel, uninstall this patch
Then, in the Start Menu, run and enter regsvr32/u msxml4.dll to confirm.
Search for the msxml4.dll file in the host
Delete all searched items
Restart the system, run the patch again, and try again.

That is, the original xml4.0 is uninstalled, automatic updates are installed, and Manual updates are made online after the restart. No new updates can be found at this time, that is, the problem is solved.

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I personally think there is a problem with the original msxml4 SP2 patch, so I uninstalled the original msxml4 SP2 patch. If it is wrong, Microsoft will return it to me, so I uninstalled it.
Add or delete ProgramWe can see that there were two patches in the past. We can unload the first one and enter regsvr32/u msxml4.dll in cmd to save the need for a system to call it.
I can't install the 8.15 patch.
Uninstall the agent again, input regsvr32/u msxml4.dll, and patch it.
The final version of msxml4.dll is 4.20.9848.0. Only the MSXML 4.0 sp2 (kb936181) patch is added to the delete program ).