Install .NET Framework 3.5 in Windows 10  

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    Install .NET Framework 3.5 in Windows 10

    Install .NET Framework 3.5 in Windows 10

    How to Install .NET Framework 3.5 in Windows 10
    Published by Category: Apps & Features
    27 Sep 2020
    Designer Media Ltd



    How to Install .NET Framework 3.5 in Windows 10


    The .NET Framework is a managed execution environment for Windows that provides a variety of services to its running apps. It consists of two major components: the common language runtime (CLR), which is the execution engine that handles running apps, and the .NET Framework Class Library, which provides a library of tested, reusable code that developers can call from their own apps.

    The Windows 10 May 2019 Update comes with .NET Framework 4.8 preinstalled.

    However, some older apps may require .NET framework 3.5 to be installed to run.

    See also:

    This tutorial will show you different ways to install .NET Framework 3.5 online and offline in Windows 10.

    You must be signed in as an administrator to install .NET Framework 3.5.


    If you need to repair .NET Framework 3.5, you can uninstall it and then reinstall it using an option below to do so.



    Contents







    OPTION ONE

    Install .NET Framework 3.5 on Demand


    This option requires an Internet connection to install .NET Framework 3.5.


    1 You may see the following configuration dialog if you try to run an app that requires the .NET Framework 3.5. Click/tap on Install this feature. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_on_demand.jpg

    2 If prompted by UAC, click/tap on Yes.

    3 Windows Features will now search, download, and install required files for .NET Framework 3.5 online from Windows Update. (see screenshots below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-2b.png Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-3.png Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-4.png

    4 Click/tap on Close when finished and successfully installed. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-5.png






    OPTION TWO

    Install .NET Framework 3.5 in Windows Features


    This option requires an Internet connection to install .NET Framework 3.5.


    1 Open the Control Panel (icons view), and click/tap on the Programs and Features icon.

    2 Click/tap on the Turn Windows features on or off link on the left side. (see screenshot below)

    This will open the C:\Windows\System32\OptionalFeatures.exe file.

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-1.jpg

    3 If prompted by UAC, click/tap on Yes.
    4 Select Install .NET Framework 3.5 in Windows 10-square.png (black square) .NET Framework 3.5 (includes .NET 2.0 and 3.0), and click/tap on OK. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-2.jpg

    5 Click/tap on Let Windows Update download the files for you. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-3.jpg

    6 Windows Features will now download and apply (install) required files for .NET Framework 3.5 online from Windows Update. (see screenshots below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-4.jpg Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-5.jpg

    7 Click/tap on Close when completed. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_windows_features-6.jpg






    OPTION THREE

    Install .NET Framework 3.5 by Download


    This option requires an Internet connection to install .NET Framework 3.5.


    1 Go to the Download .NET Framework 3.5 SP1 Microsoft website, and click/tap on the Download .NET Framework 3.5 SP1 Runtime button at the site. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-1.jpg

    2 Save the dotnetfx35.exe file to your desktop, and run it.

    3 If prompted by UAC, click/tap on Yes.

    4 Click/tap on Download and install this feature. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-2.png

    5 Windows Features will now search, download, and install required files for .NET Framework 3.5 online from Windows Update. (see screenshots below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-2b.png Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-3.png Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-4.png

    6 Click/tap on Close when finished and successfully installed. (see screenshot below)

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_manual_download_and_install-5.png

    7 You can now delete the dotnetfx35.exe file if wanted.






    OPTION FOUR

    Install .NET Framework 3.5 in Command Prompt


    This option requires an Internet connection to install .NET Framework 3.5.


    1 Open an elevated command prompt.

    2 Copy and paste the command below into the elevated command prompt, and press Enter. (see screenshot below)

    Dism /online /Enable-Feature /FeatureName:"NetFx3"

    3 When it has finished installing, you can close the elevated command prompt if wanted.

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_command_prompt.png






    OPTION FIVE

    Install .NET Framework 3.5 in PowerShell


    This option requires an Internet connection to install .NET Framework 3.5.


    1 Open an elevated PowerShell.

    2 Copy and paste the command below into the elevated PowerShell, and press Enter. (see screenshots below)

    Enable-WindowsOptionalFeature -Online -FeatureName "NetFx3"

    3 When it has finished installing, you can close the elevated PowerShell if wanted.

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_powershell-1.png Install .NET Framework 3.5 in Windows 10-net_framework_3.5_powershell-2.jpg






    OPTION SIX

    Install .NET Framework 3.5 Offline


    This option does not use an Internet connection to install .NET Framework 3.5. This can be handy if you are unable to install .NET Framework 3.5 using any of the other options above.


    1 Perform one of the following actions depending on what you want to use:

    If you don't use media that is the exact same Windows 10 build as what is currently installed, you will get a source files not found error, and .NET Framework 3.5 will fail to install.


    A) Connect a Windows 10 installation USB that is the exact same build as what is currently installed.

    OR

    B) Mount a Windows 10 ISO that is the exact same build as what is currently installed.

    How to See Full Details including Build for a Windows 10 ISO file


    2 Open This PC in File Explorer (Win+E), and make note of the drive letter (ex: "G") of this USB or mounted ISO. (see screenshot below)

    If you like, you can download and run the Install_NET_Framework_3.5_Offline.bat file below created by Paul Black to perform these steps for you instead of manually.

    Download


    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_offline_install-1.jpg

    3 Open an elevated command prompt.

    4 Type the command below into the elevated command prompt, and press Enter. (see screenshot below)

    Dism /online /enable-feature /featurename:NetFX3 /Source:<drive letter>:\sources\sxs /LimitAccess

    Substitute <drive letter> in the command above with the actual drive letter (ex: "G") from step 2 above for the USB or mounted ISO source.

    For example: Dism /online /enable-feature /featurename:NetFX3 /Source:G:\sources\sxs /LimitAccess


    5 When it has finished installing, you can close the elevated command prompt if wanted.

    Install .NET Framework 3.5 in Windows 10-net_framework_3.5_offline_install-2.jpg


    That's it,
    Shawn





  1. Posts : 12,492
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #1

    I got both 3.5 and 4.8 as a combination update just before Build 18362.329 would install on several computers on 8/30 through 9/3, seemed to give the impression it was required first.
      My Computers


  2. Posts : 2,663
    Windows 11 21H2 (22000.593)
       #2

    Berton said:
    I got both 3.5 and 4.8 as a combination update just before Build 18362.329 would install on several computers on 8/30 through 9/3, seemed to give the impression it was required first.
    Interesting. I'm on 1903 (aka build 18362.295) on my desktop, and I've just received a cumulative update for .NET 3.5 and 4.8:

    Install .NET Framework 3.5 in Windows 10-winx-18362-.net-cumulative-update-1.png

    Could this be what you are referring to?
      My Computers


  3. Posts : 61,941
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #3

    It would be an update, but unrelated or required for installing .NET Framework 3.5.

    Cumulative Update KB4511555 .NET Framework 3.5, 4.8 Windows 10 Aug. 30
      My Computers


  4. Posts : 2,663
    Windows 11 21H2 (22000.593)
       #4

    Yup - that's why I asked - because when I clean installed 18362 on my desktop it did not have .NET 3.5, and I had to later manually install it - so I'm curious why his installs would say it was required prior to installing 18362.
      My Computers


  5. Posts : 61,941
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #5

    johngalt said:
    Yup - that's why I asked - because when I clean installed 18362 on my desktop it did not have .NET 3.5, and I had to later manually install it - so I'm curious why his installs would say it was required prior to installing 18362.

    I'm not sure unless something installed required 3.5.
      My Computers


  6. Posts : 2,663
    Windows 11 21H2 (22000.593)
       #6

    Exactly - which is how I always get it (one or more apps require it, and they tell you when installing). But at that point, if you have such an app, it should already be installed. Hence my confusion.
      My Computers


  7. Posts : 803
    Windows 10 Enterprise x64 19044.1806
       #7

    johngalt said:
    Exactly - which is how I always get it (one or more apps require it, and they tell you when installing). But at that point, if you have such an app, it should already be installed. Hence my confusion.

    You can enable it on the install.wim, after doing a clean install .NET 3.5 is already installed.

    Install .NET Framework 3.5 in Windows 10-screenshot-90919009-.png
      My Computer


  8. Posts : 2,663
    Windows 11 21H2 (22000.593)
       #8

    Indeed. Great idea of deploying to large numbers of PCs.
      My Computers


  9. Posts : 16,180
    Win 10 Pro 64-bit v1909 - Build 18363 Custom ISO Install
       #9

    Hello @Brink,

    I have just updated the following Batch script which I wrote quite a while ago now to install .NET Framework v3.5. If you think it is going to be useful perhaps you would like to include it in the Tutorial as part of OPTION SIX - Install .NET Framework 3.5 Offline for example.

    Code:
    @echo off
    :: ######################################################################################################
    :: # Title     : Install .NET Framework v3.5 Offline Using Installation Media                           #
    :: # Created By: Paul Black at TenForums.com/members/paul-black.html                                    #
    :: # Created In: September 2020                                                                         #
    :: # Tutorial  : https://www.tenforums.com/tutorials/140142-install-net-framework-3-5-windows-10-a.html #
    :: ######################################################################################################
    title Install .NET Framework v3.5 - Written by Paul Black.
    mode con: cols=80 lines=25 & color 17
    set "params=%*"
    cd /d "%~dp0" && ( if exist "%temp%\getadmin.vbs" del "%temp%\getadmin.vbs") && fsutil dirty query %systemdrive% 1>nul 2>nul || ( echo Set UAC = CreateObject^("Shell.Application"^) : UAC.ShellExecute "cmd.exe", "/k cd ""%~sdp0"" && %~s0 %params%", "", "runas", 1 >> "%temp%\getadmin.vbs" && "%temp%\getadmin.vbs" && exit /b)
    %windir%\system32\reg.exe query "HKU\S-1-5-19" 1>nul 2>nul || ( echo. & echo  ERROR: This Batch file MUST be run in an ELEVATED cmd prompt [ Administrator ] & echo. & echo         Right-click the Batch file and click ^<Run as administrator^>. & echo. & echo ^>Press ANY key to EXIT . . . & pause >nul & goto :Exit )
    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. & echo Installation media found on drive %setupdrv%:
      echo. & echo Installing .NET Framework v3.5 [ includes .NET v2.0 and .NET v3.0 ] . . .
                   Dism /Online /Enable-Feature /FeatureName:NetFX3 /All /Source:%setupdrv%:\sources\sxs /LimitAccess
      echo. & echo .NET Framework v3.5 should now be installed. & echo.
    ) else (
      echo. & echo ERROR: No installation media found^!
      echo. & echo You MUST either . . .
      echo. & echo    [1] Insert a DVD or USB of the exact same build and run this file again.
              echo    [2] Mount an ISO of the exact same build and run this file again. & echo.
    )
    echo Press ANY key to EXIT . . . & pause >nul & goto :Exit
    :Exit
    Last edited by Paul Black; 24 Nov 2020 at 07:50.
      My Computer


 

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