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Here is how to install NetFramework 3.5 offline in windows 10 & Windows 8.1 / 8 .

  1. Open Start Menu and press cmd , Now press Ctrl+Shift+Enter , This opens administrative command prompt.
    nETFRAMEWORK1
  2. Now copy the below code and replace The drive letter source for windows 10 setup files for example here is E:Dism /online /enable-feature /featurename:NetFX3 /All /Source:E:sourcessxs /LimitAccessas
    windows 10 supports copy paste in command prompt , So in command prompt windows just paste it by Ctrl+V  , changing above mentioned source, press ENTER , This takes few minutes
    nETFRAMEWORK2
  3. That’s Done

 

I Found a interesting script that automatically finds mounted Images and Installs Net-framework 3.5

@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:sourcesinstall.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%:sourcessxs /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


Copy and save this as .bat file and right click and run as administrator

 

Source of script– Winaero