Offline installation of .NET framework 3.5 on windows 10
- Insert your Windows 10 DVD, or double click its ISO image, or insert your bootable flash drive with Windows 10 depending on what you have.
- Open ‘This PC’ in File Explorer and note the drive letter of the installation media you have inserted. In my case it is disk D.
- Now open an elevated command prompt and type the following command.
Dism /online /enable‐feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess
Replace D: with your drive letter for Windows 10 installation media.