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Hi Gary Or,
Based on the screenshots, it seems like KB5129195 (26300.9457) is specifically failing with 0x80073712. Since the update files are said to be having issues, consider:
1 - Manually download the update:
- Open Disk Cleanup as Administrator > clean up temporary and update files
- (Optional) Reset Windows Update components with Command Prompt (Admin)
- Visit: https://www.catalog.update.microsoft.com/Search.aspx?q=KB5129195
- Download the package for your Windows 11 26H2 Home Insider Preview.
2 - Reinstallation repair (keeping files and apps)
- Use built-in repair option
- Open Settings > System > Recovery > Fix problems using Windows Update
- Click Reinstall now > follow the onscreen instructions to reinstall Windows.
- If it's unavailable or doesn't resolve it, perform an Insider in-place upgrade
- Refer to Using ISOs - Windows Insider Program | Microsoft Learn
- Download your chosen ISO or create a bootable USB.
- Mount the ISO > run
setup.exefile to launch the install process. - Select Keep Windows settings, personal files, and apps option.
Disclaimer: Both Windows reinstallation and in-place upgrade will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend backing up important data first before making large system changes.
If installation still fails even after a reinstallation, then the issue might lies in the update package itself. In that case, please report this to the engineering team by pressing Win + F to open Feedback Hub > Report a problem.