Install .Net Framework 3.5 on Windows 10 using Microsoft Instructions

I am trying to install .Net Framework 3.5 on Windows 10 using the Microsoft's instructions.

I downloaded dotnetfx35.exe

And when it runs I get this error:

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So I click on the Tell me how to solve this problem link and I get this instruction:

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Could someone please make those instructions a bit more clear?

An iso of what?

How do i mount an iso?

Where am I going to see "Alternate source file path"?

Do I run gpupdate /force from a cmd prompt?

Do I need that cmd prompt to be started as administrator?

This is a windows 10 machine and I only have remote access to it. I can not be physically by the computer.

This question is different than the other questions because:

  1. I included a screenshots of the errors I am getting.
  2. I am asking how to install using Microsoft's instructions, not just any instructions.
  3. I have a specific error number that I encountered.

2 answers

  • answered 2017-12-06 01:19 virusstorm

    The offline installer doesn't work for Windows 8 and up. You need to enable the Windows feature. Hit the Windows key and type "Turn Windows features on or off". Check off the .NET Framework 3.5. This will download the necessary bits and install the framework on your machine. Take a look at the Install the .NET Framework 3.5 on Windows 10, Windows 8.1, and Windows 8 for more details.

    If you continue to get the above error, you are missing the side-by-side (SxS) install files. To fix this, you need to create an ISO of the Windows 10 installation media. To do this, read Create installation media for Windows.

    Once there, you mount that ISO in Windows 10 by either double clicking it or right clicking on it and selection Mount.

    Next, you will need enable the group policy setting that allows you to point your the alternate sources for SxS install files to the ISO you just mounted. You will need to read the article .NET Framework 3.5 installation error: 0x800F0906, 0x800F081F, 0x800F0907 and follow the directions for Windows 8 (the group policy object is the same for Windows 8, 8.1 and 10).

    Now you should be able to turn the Windows feature on without an issue. There are few reasons that cause this issue, but the most common is an issue trying download the files from Windows Update. If you are in an environment that runs WSUS, the administrator my not have approved .NET Framework 3.5 which preventing the download.

  • answered 2017-12-06 01:20 John Mitchell

    Looks like Microsoft is suggesting you use an ISO of the Windows installation disk to install .NET from it. Which you obviously won't be doing remotely, it probably wouldn't help anyway.

    A quick search on Google about it revealed this page:

    https://winaero.com/blog/offline-install-of-net-framework-3-5-in-windows-10-using-dism/