Resolve error 0x800f0805

Question

Resolve error 0x800f0805

Garvit Bhardwaj 65

Update Name- 2025-08 Cumulative Update for Windows 10 Version 22H2 for x64-based Systems (KB5066188)

Error message- There were problems downloading some updates, but we'll try again later. If you keep seeing this, try searching the web or contacting support for help. This error code might help: (0x800f0805)

Steps already Taken-

Troubleshoot- Not able to detect any issue for updates so issue not resolved
Restart the PC
Wufix file- Issue still continues

Please suggest me how to resolve this issue as I do not want to reinstall full windows. This issue appeared after I installed some "update preview".

Brandon Bradley 0 Reputation points

2026-07-09T05:12:57.0066667+00:00

I am receiving the same error message. It is actually preventing me from enrolling in ESU. I have been stuck on the same update for months.
Ramesh 183.5K Reputation points Volunteer Moderator

2026-07-09T05:20:20.73+00:00
Download Windows 10 Media Creation Tool (MCT) from this link → https://go.microsoft.com/fwlink/?LinkId=2265055

Run MCT and accept the license agreement.

Click "Upgrade this PC now". This starts the repair installation.

Your apps, settings, and files will be kept by default during a repair install.
Ramesh 183.5K Reputation points Volunteer Moderator

2026-07-09T05:21:02.9566667+00:00

@Brandon Bradley See my reply above.
Tamaz Gogichev 0 Reputation points

2026-10-17T19:09:37.69+00:00

Hello,

I am using Windows 10 Pro, version 22H2, OS build 19045.7725. My PC is registered for Extended Security Updates (ESU).

The October 2026 cumulative update KB5126657 fails to install through Windows Update with error 0x800f0805.

I downloaded the official x64 MSU package from the Microsoft Update Catalog, but manual installation also fails. Windows Update Standalone Installer reports error 2149842967 (0x80240017), indicating that the package is not applicable.

I have already:

Run DISM /Online /Cleanup-Image /RestoreHealth successfully.

Run sfc /scannow successfully.

Run the Windows Update troubleshooter.

Cleared the Windows Update download cache.

Used Microsoft's official Windows 10 Update Now tool, which reported that the update completed successfully.

The system remains on build 19045.7725, and the update problem persists.

Could you please investigate why KB5126657 is considered not applicable to my Windows 10 22H2 ESU system and advise on the correct resolution?

Thank you.
IRENE G 0 Reputation points

2026-10-31T14:37:28.5566667+00:00

Same here. After trying ALL the other 'fixes' the remaining solution was using Media Creation Tool - installing a clean Windows 10.

KB5126657 IS applicable, but corruption somewhere is preventing you from installing it.

Running DISM /Online /Cleanup-Image /RestoreHealth and sfc /scannow did not fix my issues. Neither did the other "fixes" others have recommended..

Help.microsoft.com, enter "error 8x800f0805 kb5126657 fails to update" and follow the instructions step by step. When I reached Step 6 to reregister bits and Windows update files, after running the 36 commands they give you, I had multiple errors come up, but there was no option to say: "I have these errors, how do I fix them"

So, MCT was the final fix and it worked. Find it here: https://www.microsoft.com/en-us/software-download/windows10, or directly download here: https://go.microsoft.com/fwlink/?LinkId=2265055

It takes many hours to do. Once the Windows 10 repair is complete, you need to run many Windows updates to get to the latest OS Build of 22H2.

Good luck.

3 answers

Your answer

Brandon Bradley 0 Reputation points

2026-07-09T05:12:57.0066667+00:00

I am receiving the same error message. It is actually preventing me from enrolling in ESU. I have been stuck on the same update for months.
Ramesh 183.5K Reputation points Volunteer Moderator

2026-07-09T05:20:20.73+00:00

Download Windows 10 Media Creation Tool (MCT) from this link → https://go.microsoft.com/fwlink/?LinkId=2265055

Run MCT and accept the license agreement.

Click "Upgrade this PC now". This starts the repair installation.

Your apps, settings, and files will be kept by default during a repair install.
Ramesh 183.5K Reputation points Volunteer Moderator

2026-07-09T05:21:02.9566667+00:00

@Brandon Bradley See my reply above.
Tamaz Gogichev 0 Reputation points

2026-10-17T19:09:37.69+00:00

Hello,

I am using Windows 10 Pro, version 22H2, OS build 19045.7725. My PC is registered for Extended Security Updates (ESU).

The October 2026 cumulative update KB5126657 fails to install through Windows Update with error 0x800f0805.

I downloaded the official x64 MSU package from the Microsoft Update Catalog, but manual installation also fails. Windows Update Standalone Installer reports error 2149842967 (0x80240017), indicating that the package is not applicable.

I have already:

Run DISM /Online /Cleanup-Image /RestoreHealth successfully.

Run sfc /scannow successfully.

Run the Windows Update troubleshooter.

Cleared the Windows Update download cache.

Used Microsoft's official Windows 10 Update Now tool, which reported that the update completed successfully.

The system remains on build 19045.7725, and the update problem persists.

Could you please investigate why KB5126657 is considered not applicable to my Windows 10 22H2 ESU system and advise on the correct resolution?

Thank you.
IRENE G 0 Reputation points

2026-10-31T14:37:28.5566667+00:00

Same here. After trying ALL the other 'fixes' the remaining solution was using Media Creation Tool - installing a clean Windows 10.

KB5126657 IS applicable, but corruption somewhere is preventing you from installing it.

Running DISM /Online /Cleanup-Image /RestoreHealth and sfc /scannow did not fix my issues. Neither did the other "fixes" others have recommended..

Help.microsoft.com, enter "error 8x800f0805 kb5126657 fails to update" and follow the instructions step by step. When I reached Step 6 to reregister bits and Windows update files, after running the 36 commands they give you, I had multiple errors come up, but there was no option to say: "I have these errors, how do I fix them"

So, MCT was the final fix and it worked. Find it here: https://www.microsoft.com/en-us/software-download/windows10, or directly download here: https://go.microsoft.com/fwlink/?LinkId=2265055

It takes many hours to do. Once the Windows 10 repair is complete, you need to run many Windows updates to get to the latest OS Build of 22H2.

Good luck.

Answer 1

Hi, good day!

Please try the following methods below.

Make sure Windows Update and Background Intelligent Transfer services are available and running.

Click Start, type services.msc in the Start Search text area, and then click services.msc in the programs list. If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.

Double-click Background Intelligent Transfer Service.

If the Startup status lists Stopped, click Start and then click OK. If the status is Running, right click then select Restart

Double-click Windows Update.

If the Startup status lists Stopped, click Start and then click OK. If the status is Running, right click then select Restart

Reset Windows Update Components

https://www.tenforums.com/tutorials/24742-reset-windows-update-windows-10-a.html

Here's a direct download link of KB5066188 from Microsoft Update Catalog. Download and install the update manually.

https://catalog.s.download.windowsupdate.com/c/msdownload/update/software/updt/2025/08/windows10.0-kb5066188-x64_441ad3d5d5e632d0e649d59e5a3e085ee79200b1.msu

I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed.

Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Garvit Bhardwaj 65 Reputation points

2025-08-23T13:23:08.6766667+00:00

I tried Reset Windows Update Components but issue not resolved.

Also I downloaded KB5066188 from Microsoft Update Catalog but got this error
Darth Rock 0 Reputation points

2025-11-11T07:09:27.9933333+00:00

I've tried all of your suggestions, and nothing worked.

Answer 2

Garvit Bhardwaj 65

I tried Reset Windows Update Components but issue not reloved.

User's image

Marvin LaFleur 50 Reputation points

2025-09-13T19:57:12.34+00:00

Having same problem trying to install KB5065429 get the error code 0x800f0805. tried everything but re set and downloading win10 again and re installing. Actually this problem started with 5066188 say installed but does not show in history and when I Iook to uninstall it. I currently have Win10 22H2 and ver 19045.6282. In Winupdate is shows ESU ready.
Marvin LaFleur 50 Reputation points

2025-09-13T20:03:13.04+00:00

I do believe that a previous update is needed that disappeared when I had to re set the computer after the problems caused by 5066188. But, the only thing avaiable is the KB5065429 which it refuses to install
Ramesh 183.5K Reputation points Volunteer Moderator

2025-09-14T02:50:06.95+00:00
@Marvin.

Download Windows 10 Media Creation Tool (MCT) from this link: https://go.microsoft.com/fwlink/?LinkId=2265055

Run MCT and accept the license agreement.

Click "Upgrade this PC now". This starts the repair installation.

Your apps, settings, and files will be kept by default during a repair install/in-place upgrade.

(or)

To fix this surgically, share the CBS logs.
Garvit Bhardwaj 65 Reputation points

2025-09-15T02:13:17.9766667+00:00

I want to fix it surgically and I have uploaded by CBS log also in attachment. Please help. CBS.log @Ramesh
Ramesh 183.5K Reputation points Volunteer Moderator

2025-09-15T02:37:01.98+00:00
@Garvit.

Please share the link to the CBS logs. To collect the logs, open PowerShell admin and run:

Compress-Archive C:\Windows\Logs\CBS -f (join-path ([environment]::GetFolderPath('Desktop')) \CBS.zip)

This creates a file named CBS.zip on your desktop. Share it on OneDrive or GoFile.io and post the link here.
Garvit Bhardwaj 65 Reputation points

2025-09-15T04:06:50.8466667+00:00

https://gofile.io/d/MiFvCT
@Ramesh Srinivasan
Please help to resolve this error
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Ramesh 183.5K Reputation points Volunteer Moderator

2025-09-15T04:17:11.9+00:00
Please also export the CBS key and share the zipped copy.

From admin Command Prompt, run:

reg save "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing" C:\CBS.dat

Share C:\CBS.dat.
James Holley 0 Reputation points

2026-02-06T06:14:51.64+00:00

Same issue here, NOTHING WORKS! PERIOD!
ameer alameer 0 Reputation points

2026-04-24T23:26:32.7833333+00:00

error-0x800f0805

Answer 3

If the issue persists, please try performing an In-place Upgrade. It will definitely help in resolving update errors. Performing this can repair broken operating system files while your personal files, settings and installed applications will not be removed.

Few things to check on the PC

Unplug all external peripherals except for the Mouse, Keyboard, and LAN cable before starting
Disable or uninstall any third-party Antivirus program to prevent it from interfering with the upgrade

Download the media creation tool (Click Download tool now) and save it to your computer.

https://www.microsoft.com/en-us/software-download/windows10

Open the tool and select Upgrade this PC now.

Make sure to select Keep personal files and apps.

It might take some time to install Windows 10.

Your computer will restart a few times, make sure you don’t turn off your PC.