You can fix windows update install error code 0x80070103 in Windows 11 easily by these two methods.
Method 1: Pause the updates and instantly resume the updates!
Method 2: Right click on Start button – Terminal Admin. Copy the following codes at once

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C://Windows//SoftwareDistribution SoftwareDistribution2024
ren C://Windows//System32//catroot2 catroot22024
sc.exe config wuauserv start=auto
net start wuauserv
sc.exe config cryptsvc start=auto
net start cryptSvc
sc.exe config bits start=auto
net start bits
net start msiserver

Right click to paste in the terminal. The commands will execute automatically. Press the enter key to run the last command. Restart your computer after executing all commands.

The functionality of these commands:
The first four commands stops four Windows Services to rename two folders without errors
a- windows update service
b- cryptographic service
c- background intelligent transfer service.
d- windows installer service.
The next two commands renames two folders
a- SoftwareDistribution folder in Drive C – Windows
b- catroot2 folder in Drive C – Windows – System32
The last seven commands sets those services to automatic and stars those services.

Restart your computer to apply the changes. Hope this helps!
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