Error 0x800F081F when installing .NET 3.5 (Windows 10)

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windows-10
.net-3.5

2 Answers

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Install .NET 3.5 from Windows 10 Installation Media - Add Feature.

Sources: KB 2734782, Offline install of .NET Framework 3.5 in Windows 10 using DISM

  1. Mount the installation media, then check My Computer to find the drive letter.

    If you do not have an installation medium available, you can also use the media creation tool to create an install disk.

    These instructions assume the installation DVD is drive D:—change this to the correct letter if yours is different!

  2. Run Dism /online /enable-feature /featurename:NetFx3 /Source:D:\sources\sxs /all /LimitAccess as Administrator.

    1. Find "Command Prompt" in the Start menu.
    2. Right-click it and select "Run as Administrator".
    3. In the Command Prompt, type the following command and press Enter:
      Dism /online /enable-feature /featurename:NetFx3 /Source:D:\sources\sxs /all /LimitAccess
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Install .NET 3.5 from Windows 10 Installation Media - Add Package.

  1. Mount the installation media, then check My Computer to find the drive letter.

    If you do not have an installation medium available, you can also use the media creation tool to create an install disk.

    These instructions assume the installation DVD is drive D:—change this to the correct letter if yours is different!

  2. Run dism /online /add-package /packagepath:D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab as Administrator.

    1. Find "Command Prompt" in the Start menu.
    2. Right-click it and select "Run as Administrator".
    3. In the Command Prompt, type the following command and press Enter:
      dism /online /add-package /packagepath:D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab

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