.NET Framework 3.5 installation error: 0x800F0950

FOLLOWUP: 

I created a USB installation media on my Surface Pro 4 as per this webpage:

https://www.microsoft.com/en-us/software-download/windows10

I left the USB flash drive in the Surface Pro 4 and ran your script as Administrator.  It still says that "No installation media found!"

I can't believe it's so tough to install .NET Framework 3.5 on what is essentially a new Surface Pro 4.  All conventional attempts to install it, I.e. through Windows Features, gave me error 0x800F0950.  Windows 10 has all the latest updates (I ran Update 3 times prior to this and no updates were available).  Please help!

Open Notepad then copy in this code

@echo off

Title .NET Framework 3.5 Offline Installer

for %%I in (D E F G H I J K L M N O P Q R S T U V W X Y Z) do if exist "%%I:\sources\install.wim" set setupdrv=%%I

if defined setupdrv (

echo Found drive %setupdrv%

echo Installing .NET Framework 3.5...

Dism /online /enable-feature /featurename:NetFX3 /All /Source:%setupdrv%:\sources\sxs /LimitAccess

echo.

echo .NET Framework 3.5 should be installed

echo.

) else (

echo No installation media found!

echo Insert DVD or USB flash drive and run this file once again.

echo.

)

pause

Save the file as netfx.cmd

Right click it and choose Run as administrator.

The file will install .NET Framework 3.5 automatically after finding the drive letter of your Windows 10 installation media.

If media not found insert Win10 Usb or Dvd drive and run as administrator again.

Thanks for the script. 

• I downloaded Windows 10 ISO from the Media Toolkit site. (https://www.microsoft.com/en-us/software-download/windows10#34de222e-6944-44aa-8f45-8e96988880a4)
• Mounted it, system assigned it as Drive F:

Script didn't work. I believed there is no file INSTALL.WIM in my ISO's sources directory. 

Any feedback on this file?

• I tried to just execute directly:

Dism /online /enable-feature /featurename:NetFX3 /All /Source:F:\sources\sxs /LimitAcces

• Received Error: 07
  • Researched and indicated problem with /LimitAccess option.
• Checked DISM help and could not find that option. 
  • We have latest Windows 10 build 1803.  Is /LimitAccess now not a valid option?
• Anyway, I removed it, ran it again and feature reported successfully installed. However, my application still won't install but no longer indicates we need to add .net 3.5.
• Check via Control Panel and it appears it was installed also.

Now i think i did everything as you said I mean I'm not much of a programmer but still things went pretty Smooth at first but then as you said in your instruction If media not found insert Win10 usb and yes it did not find the media and put in the usb and it would still not find the media. But now as I think about when you said Insert WIN10 usb did you mean theres a specific usb for win 10 or just any usb because as I think about it right I'm pretty using and ordinary usb...so please explain

Hi Adam,

You need to create a Windows 10 installation media using your USB. For the steps, please check this article. Once you're done creating an installation media, you may proceed performing the steps provided by Andre Da Costa.

Feel free to post back should you need further help.