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.
  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
  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 .NET Framework 3.5 should be installed
) else (
echo No installation media found!
echo Insert DVD or USB flash drive and run this file once again.

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


Source of script- Winaero