Same problem, found no sollution
windows 11 won't install updates
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(0, 8%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJC%3C/text%3E%3C/svg%3E)
Jason Coon
30
Reputation points
Hello.
The following are the errors when trying to install updates:
2025-10 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for x64 (KB5066131) Install error - 0x800f0900
025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) (26100.6899)
Windows 11 version 25H2 is available we couldn't install this update but you can try again
(0x800705b9)
Thank you in advance for your help.
Windows for home | Windows 11 | Windows update
7 answers
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Pablo Miguel Saval Sendra 5 Reputation points2025-10-26T18:18:23.78+00:00 -
Jason Coon 30 Reputation points
2025-11-08T15:27:03.7366667+00:00 I was able to contact microsoft tech support. I was told they are working on a solution to the problem. Sure they are...
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(163.2, 72%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAC%3C/text%3E%3C/svg%3E)
Aaron Cannon 0 Reputation points2025-11-07T22:11:28.5066667+00:00 Anyone find a solution yet? Running into the same issues.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(224.00000000000003, 69%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERB%3C/text%3E%3C/svg%3E)
Rue Burch 0 Reputation points2025-10-27T22:30:59.81+00:00 I'm having the exact same problem, and it has been for weeks. The steps suggested above do not help.
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Jason Coon 30 Reputation points
2025-11-10T13:56:02.7066667+00:00 I have been dealing with this for 2 months. No help. Just what the public needs is more junk software.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(281.6, 72%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ET%3C/text%3E%3C/svg%3E)
TOVDEW 0 Reputation points2025-10-27T20:00:55.3166667+00:00 I'd download the ISO for 25H2 and run the setup from that, if it fails the update, download setupdiag and use that to find out why it's failing.
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Jason Coon 30 Reputation points
2025-11-10T13:47:31.6266667+00:00 I tried to download setupdiag from microsoft, I click on run as administrator. A window pops up for a split second, then disappears???
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John Jefferson Doyon 71,160 Reputation points Independent Advisor2025-10-22T03:29:04.82+00:00 Hi, I'm John! I will help you with this.
May I know what other troubleshooting steps have you already taken? This will help me avoid recommending them again.
Can I ask if you’ve already checked whether you have any third-party antivirus software running?
If you haven't tried anything yet please start by:
First, make sure there's no third-party antivirus software active that might be interfering with the update process:
- Open the Windows Security app.
- Click the "Settings" (gear icon) in the lower left.
- Under Security Providers, click "Manage Providers".
- Verify if Microsoft Defender Antivirus is the active antivirus and Windows Firewall is the firewall.
- If not, please uninstall the third-party antivirus, restart your PC, and check again at Settings > Windows Update.
If issue persists, run again the Windows Update Troubleshooter from Get Help app:
- Open Settings > System > Troubleshoot > Other troubleshooters.
- Find Windows Update and click Run. This will open the Get Help app.
- Select "I can't download, install, or uninstall an update" and click "Yes".
- This will automatically identify and address any errors and restart the update process. This step is purely automatic.
- Please continue to follow the prompt if the issue persists.
If the issue persists, please provide more details by answering my questions.
Click "Add comment" below to let me know.
Regards,
John J.D.
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Jason Coon 30 Reputation points
2025-11-10T13:39:48.93+00:00 I have tried all of that. no luck. thank you for your response.
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