These are just notes for myself. I will rewrite this article when i get to the bottom of the issue i’m fixing.

https://blogs.technet.microsoft.com/joscon/2010/05/26/using-checksur-and-update-packages-to-fix-corruption/

How to extract msu/msp/msi/exe files from the command line

I find these commands quite helpful — maybe you know them already — if not, here you go:

Microsoft Hotfix Installer (.exe)

setup.exe /t:C:<target_dir> /c

Microsoft Update Standalone Package (.msu)

expand -F:* update.msu C:<target_dir>
cd <target_dir>
expand -F:* update.cab C:<target_dir>

Microsoft Patch File (.msp)

msix patch.msp /out C:<target_dir>
msix.zip

Windows Installer Package (.msi)

msiexec /a setup.msi /qb TARGETDIR=C:<target_dir>

https://blogs.technet.microsoft.com/roplatforms/2010/05/12/how-to-fix-server-manager-errors-after-installing-updates-hresult0x800f0818-hresult0x800b0100/