The recent problem with Windows 10 Build 19041.450 is that it giveserror 0x800f081fduring installation of KB4571756.
This kind of error is related to .NET Framework Installation in the earlier KB updates.
As seen in thisarticle, this update was released in Sep, 2020.
There is a known issue in KB4571756 update.
Image Source: answers.microsoft.com
In this error code of0x80070020, updates cannot be installed.
In this article, we are going to look at how tosolve 0x800f081f error in Windows 10.
In this regard, the recent SSU has been found to be KB4577266.
If you are using Windows Update, then this SSU is offered automatically.
Otherwise, you’ve got the option to search Microsoft Update Catalog to download this SSU.
Method #1 : Download .NET FRAMEWORK 3.5 files
Most probably this solution should work.
If this didnt work, go to the next method.
This is because the source files of .NET 3.5 exist in this media.
you’re free to download the original Windows 10 source using Microsofts media creation tool from their website.
It is available for Windows 10 Pro users only.
This will activate the policy and its related functionality.
you’ve got the option to read the policy description for its complete understanding.
If this service has any problem, then also the KB update wont install properly.
where x: is the windows 10 installation drive.
This should solve the 0x800f081f error.
