I am running Windows 10 Home 2004 (Build 19041.450). Windows Update notified me that there was a cumulative update available to install (2020-09 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4571756)). When I told it to install the update, it will download and go up to "Installing - 100%" and then just show this error: I've tried the following in an attempt to fix the error: Run "sfc /scannow" in an elevated command prompt Run "DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:<Source of clean Windows 10 2004 ISO created using Windows Media Creation Tool> /LimitAccess" in an elevated command prompt Uninstall and reinstall NET framework 3.5 from "Turn Windows features on or off" in Control Panel Manually download the specific update from the Microsoft Update Catalog and install it Stop the Windows Update service and delete the Windows Update cache located in "%SystemRoot%\SoftwareDistrubution", then restart the service Obviously, none of these worked so I'm looking for any other solutions to this problem. Any help is appreciated.

I tried this script. No change on update instal but did crash my boot drive which windows tried to repair and was unable to. Had to resort to recover from backup. This update, (KB4571756), stinks and ought to be deleted if MS is unwilling to fix it. Sick of bad updates.

Neither uninstalling / reinstalling .NET Framework 3.5 nor an In-Place Upgrade fixed the issue for me. Still get the same error.

Hi. I did a fresh install from scratch, (was having USB issues--I miss my XP!) and all went fine including hardware updates but this one get's to 100% and nothing. I'm pissed, I'm on a metered connection and I attempted all ways to fix it five times! Microsoft, get it together! And one last thing; more and more people are on metered connections, when an update is downloaded don't make it start from scratch! Start it from where it left off! I mean, 100% five times?!

I never had this error and the KB4571756 Cumulative Update installed normally for me. In the past there were times when the offline install worked when nothing else did. Many online search results for this error code tie it to .NET 3.5 issues, which makes me wonder if installing/removing .NET 3.5 or a .NET Cumulative Update would help the situation. I do not have .NET 3.5 enabled at all on my system. But this could just be a matching error code that shows up for .NET sometimes. To remove .NET 3.5: DISM /Online /Remove-Capability /CapabilityName:NetFX3~~~~ To add .NET 3.5: DISM /Online /Add-Capability /CapabilityName:NetFX3~~~~ .NET 3.5 can also be added/removed by running optionalfeatures.exe, which launches the Turn Windows features on or off interface. Latest .NET Cumulative Update September 8, 2020-KB4576478 https://support.microsoft.com/en-us/help/4576478 It sounds like doing an in-place "upgrade" to the same (or higher) Windows version as you have installed has worked for some to resolve this . That is done by mounting the current ISO file for Windows 10 and running setup.exe. It keeps installed apps and files.

I tried this and two things happened: On my first attempt it said there wasn't enough space to extract the files which was weird since I have like 100+ GB free. So, I changed the scratchdir to C:\Update and then it seemed all was fine untill... I hit the same error after setting a custom scratchdir: Error 0x800f081f. Sooo, my guess is that the bug is in the update just as I previously thought.

Cumulative update won't install (KB4571756) (Error 0x800f081f)

Anonymous

I am running Windows 10 Home 2004 (Build 19041.450). Windows Update notified me that there was a cumulative update available to install (2020-09 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4571756)). When I told it to install the update, it will download and go up to "Installing - 100%" and then just show this error:

I've tried the following in an attempt to fix the error:

Run "sfc /scannow" in an elevated command prompt
Run "DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:<Source of clean Windows 10 2004 ISO created using Windows Media Creation Tool> /LimitAccess" in an elevated command prompt
Uninstall and reinstall NET framework 3.5 from "Turn Windows features on or off" in Control Panel
Manually download the specific update from the Microsoft Update Catalog and install it
Stop the Windows Update service and delete the Windows Update cache located in "%SystemRoot%\SoftwareDistrubution", then restart the service

Obviously, none of these worked so I'm looking for any other solutions to this problem. Any help is appreciated.

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

217 answers

Anonymous

2020-09-18T15:45:00+00:00

I tried this script. No change on update instal but did crash my boot drive which windows tried to repair and was unable to. Had to resort to recover from backup. This update, (KB4571756), stinks and ought to be deleted if MS is unwilling to fix it. Sick of bad updates.
Was this answer helpful?

1 person found this answer helpful.

0 comments No comments
Anonymous

2020-09-18T15:06:08+00:00

Neither uninstalling / reinstalling .NET Framework 3.5 nor an In-Place Upgrade fixed the issue for me. Still get the same error.
Was this answer helpful?

1 person found this answer helpful.

0 comments No comments
Anonymous

2020-09-18T14:05:33+00:00

Hi. I did a fresh install from scratch, (was having USB issues--I miss my XP!) and all went fine including hardware updates but this one get's to 100% and nothing. I'm pissed, I'm on a metered connection and I attempted all ways to fix it five times!

Microsoft, get it together! And one last thing; more and more people are on metered connections, when an update is downloaded don't make it start from scratch! Start it from where it left off! I mean, 100% five times?!
Was this answer helpful?

1 person found this answer helpful.

0 comments No comments
Anonymous

2020-09-17T20:03:51+00:00

I never had this error and the KB4571756 Cumulative Update installed normally for me. In the past there were times when the offline install worked when nothing else did.

Many online search results for this error code tie it to .NET 3.5 issues, which makes me wonder if installing/removing .NET 3.5 or a .NET Cumulative Update would help the situation. I do not have .NET 3.5 enabled at all on my system. But this could just be a matching error code that shows up for .NET sometimes.

To remove .NET 3.5:

DISM /Online /Remove-Capability /CapabilityName:NetFX3~~~~

To add .NET 3.5:

DISM /Online /Add-Capability /CapabilityName:NetFX3~~~~

.NET 3.5 can also be added/removed by running optionalfeatures.exe, which launches the Turn Windows features on or off interface.

Latest .NET Cumulative Update September 8, 2020-KB4576478

https://support.microsoft.com/en-us/help/4576478

It sounds like doing an in-place "upgrade" to the same (or higher) Windows version as you have installed has worked for some to resolve this. That is done by mounting the current ISO file for Windows 10 and running setup.exe. It keeps installed apps and files.
Was this answer helpful?

1 person found this answer helpful.

0 comments No comments
Anonymous

2020-09-17T14:09:13+00:00

I tried this and two things happened:

On my first attempt it said there wasn't enough space to extract the files which was weird since I have like 100+ GB free. So, I changed the scratchdir to C:\Update and then it seemed all was fine untill...

I hit the same error after setting a custom scratchdir: Error 0x800f081f.

Sooo, my guess is that the bug is in the update just as I previously thought.
Was this answer helpful?

1 person found this answer helpful.

0 comments No comments