The Windows 10 is shipped with DotNET Framework 4.5 by default the Windows 10 is none shipped with DotNET Framework 3.5 by default for becoming more effective the old windows application are some thing cannot running on Windows 10 due to lack of windows DotNET Framework 3.5 support.

The tons of windows software running with old Dotnet 3.5 FX feature. Without this feature the software fail to run. This installation method consists of offline method. This method is recommended for all windows 10 user. This can be followed using step by step methodology.

The installations of DotNET Framework 3.5 is can be done using both online or offline methods. The following methods apply for those who doesn’t have any type of internet connection on their home or aren’t connected to the internet can be successfully use this types of tricks can be followed by the windows 10 users very effectively.

Step-I (Open Command Prompt with administrative privileges)

Hit  + X key and finally hit on Command Prompt (Admin)
command-prompt admin

Step-II (Mount your official Windows 10 ISO image or DVD)

Finally Mount your Windows 10 DVD or Windows 10 ISO Images and note the mount point.

Step-III (Run the Dism commands to install the DotNETFX3 feature on Windows 10)
Microsoft Windows [Version 10.0.10240]
(c) 2015 Microsoft Corporation. All rights reserved.
C:\Windows\system32>Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:J:\sources\sxs /LimitAccess

Note : Here Replace the J:\ with your windows 10 mount point or DVD drive path.

Sample Output
Deployment Image Servicing and Management tool
Version: 10.0.10240.16384
Image Version: 10.0.10240.16384
Enabling feature(s)
[==========================100.0%==========================]
The operation completed successfully.

windows-10-dism

Step-IV (Check whether the DotNET Framework is installed or Not)

Go to My Computer —-> Uninstall or Change Program —-> On left side start the Turn Windows features on or Off —–> Finally See the Checked box in front of DotNET Framework 3.5 .
windows-features
If you see the Check box in front of DotNET framework 3.5 then install is succeeded.

Congratulations now you have installed the dotnet framework 3.5 on windows 10.