windows update error

Question

Windows 11 Insider Preview 29639.1000 (rs_prerelease)
shows the instal error and gave the last date 11 august 2026
please help me to instal update

Answer 1

Hi Rudra,

The ISO for 29639 is now out if

you want to try an in place update.

https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewiso

Answer 2

Hi Sai,

Build 29639 is a Canary/Future build

not a Dev Channel build.

What build are you currently on?

Use WIN+R, type winver for the build #.

Answer 3

Hi RudraPratap yadav,

Thanks for reaching out. I understand you're unable to install Windows 11 Insider Preview 29639.1000 (rs_prerelease) and are concerned about the certificate expiration date shown as 11 August 2026. The expiration notice is a reminder that Insider devices need to move to a newer preview build, but the installation failure is typically related to a Windows Update, driver or system issue rather than the certificate itself.

To start, please disconnect any non-essential USB devices and temporarily disable any third-party antivirus or security software. Then open Command Prompt as Administrator and run the following commands:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Once the scans complete, restart your PC and try installing the update again.

If the issue persists, please try the following additional steps:

• Run the Windows Update troubleshooter:

-Go to Settings > System > Troubleshoot > Other troubleshooters

-Run the Windows Update troubleshooter.

• If the update still fails, reset the Windows Update components:

net stop bits
net stop wuauserv
ren %systemroot%\softwaredistribution softwaredistribution.bak
ren %systemroot%\system32\catroot2 catroot2.bak
net start bits
net start wuauserv

-Restart your PC and check for updates again.

Also, could you please provide the following information?

• The exact error code shown in Windows Update (for example, 0x80070005 or 0xC1900101).
• Which Insider channel you're currently enrolled in: Canary, Dev, Beta or Release Preview.

A screenshot of the Windows Update error page would also be helpful, as it may provide additional clues about what's preventing the update from installing.

I appreciate your patience while troubleshooting this issue. Once you share the requested details, I'll be happy to take a closer look and help with the next steps.

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