When you install some applications, you may be prompted for the .NET Framework 3.5 component that is installed by default in Windows from version 7. In Windows 10, the .NET Framework 4.6 is included by default (or 4.7). But there are cases when on Windows 10 to use an application require the installation of the .NET Framework 3.5 component and some users may encounter errors. The most common error is 0x800f081f when installing the .NET Framework 3.5 component.
Fix Error 0x800f081f through the system image file
If the last stage did not help, most likely the component store, namely the .NET 3.5 installer is corrupt. You can try to download the installer from the Microsoft website, but it is highly unlikely that this will help.
We will need to download the Windows 10 image. To do this, go to the Windows 10 download site and download the Media Creation Tools utility (the Download Tool Now button).
To download an image, select the following:
Step 1: Create the installation media
Step 2: On the language, architecture, and release option click Next.
Step 3: Then, select the ISO file
Step 4: Enter the save location and wait for the end
Step 5: After the image is loaded, click on it with the right mouse button and select the connect.
Step 6: The image will be mounted on a virtual disk
Step 7: The disk is mounted and you need to run the following command: Change the Drive with where you have mounted the virtual disk
Fix error 0x800f081f through the system image file (Alternative)
On the path drive:\sources\ sxs there is a file microsoft-windows-netfx3-ondemand-package.cab, which is the installation component of the .NET Framework 3.5. To install it, execute the command (Where E: this is the mounted Windows image):
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