Fix t0x800F081F error when installing .Net Framework 3.5

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.Net FrameWork 3.5 is a tool that helps Windows users to run and use specific software. However, some computers as soon as the installation of the .Net FrameWork 3.5 version get the error message “Error: 0x800F081F The source files could not be found“. Especially for those who use Windows 8 / 8.1 or Windows 10 will encounter this error frequently.

In this article, I will guide you to fix 0x800F081F when installing .Net FrameWork 3.5.

Option 1: Fix the .Net FrameWork 0x800F081F error quickly

This method has been used by hundreds of thousands of people and is a success, hope you are lucky also.

First, download this .cab file to: Microsoft-windows-netfx3-ondemand-package.cab

Copy the .cab file, paste it into the C: drive.

If the message appears, click Continue to continue.

  • Open CMD with Admin, by entering cmd in the search box and right-clicking on the matching result, select Run as administrator.

  • Enter the following command in CMD and press enter:
Dism.exe /online /enable-feature /Featurename:netfx3 /Source:C: /LimitAccess
  • Wait for bug 0x800F081F to be fixed, restart and error will disappear when you install .Net FrameWork.

Option 2: Fix the 0x800F081F error when installing .Net FrameWork 3.5 by changing the settings in Windows

At the desktop interface, right-click This PC and select Manage.

Appears Computer Management interface. In the left menu, click Services and Applications, select Services.

Next, we will click on Services to display the list on the right. Find and right-click on Windows Update and select Properties.

In the Windows Update Properties console, select the General tab. Next, select Startup type Automatic. Then press Sart> Apply> OK to save the setting.

In the Windows search bar, type the words Turn Windows Features on or off and visit.

In the Windows Feature Layout, we click on .Net FrameWork 3.5, select OK for the system to install and fix the error.