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Fix error of not being able to install .NET Framework 3.5 on Windows

Microsoft's .NET Framework is a programming platform that collects programming libraries that can be installed or are already available in Windows operating systems. Depending on your needs, your computer must install the .NET Framework program. However, machines with Windows 8 and above, especially Windows 10, have problems installing the .NET Framework 3.5.

In this article, Network Administrator will guide you step by step to fix the error of not installing .NET Framework 3.5 on your computer.

Why is .NET Framework 3.5 so important?

Although the latest version of .NET Framework 4.5.2 is pre-installed in Windows, users will always need a previous version of this framework to run applications that specifically require version 3.5 or earlier. . Version 3.5 can also be installed together with version 4 or later. This is why it is so important to install the .NET Framework 3.5 on Windows systems so that legacy applications function properly.

Fix error of not being able to install .NET Framework 3.5 on Windows

These are the most common errors you will encounter when installing the .NET Framework 3.5. Here are explanations of both error codes:

0x800F081F – The source files could not be found
0x800F0906 – The source files could not be downloaded

If you're connected to the Internet and still experiencing this issue, it's because you have the following Windows updates installed:

  • KB2966826
  • KB2966827
  • KB2966828

These are security updates for the .NET Framework 3.5 that must be installed. But because Microsoft applies these updates regardless of whether the 3.5 framework is installed or not, they will be installed even if the framework is not installed.

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If these updates are installed first and then you try to install the framework, you will get the errors mentioned above. You will need to uninstall the updates mentioned above, install the .NET Framework 3.5, and finally reinstall the updates.

The detailed method is as follows:

Step 1:

You completely exit the program on your computer. Then in the Windows search bar, enter search keywords Services and access the results found.

NET Framework error

Step 2:

In the Services interface, find and right-click on the item Windows updates and choose Properties.

NET Framework error

Step 3:

A new window interface appears. Here, we select the card General and choose Startup type section is set to Automatic mode then press Start and OK to finish.

NET Framework error

Step 4:

Return to the Windows search bar, enter the keyword group. group and click on the result above. Or use keywords gpedit.msc and also click on the results found.

NET Framework error

Step 5:

At the interface Local Group Policy Editorwe search according to the following directory path:

Computer Configuration > Administrative Templates > System.

NET Framework error

Step 6:

Double click on System. Then, in the right interface, find the item Specify settings for optional compenent installation and component repair. We right click and select Edit.

NET Framework error

Step 7:

Here, you check the box Enabled and press OK to save.

NET Framework error

Finally, restart the computer and try reinstalling the program to see if it works.

Wishing you success!

Refer to the following articles for more information:

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