Install Microsoft .NET Framework 3.5 Offline in Windows 8/8.1

To install .NET Framework 3 in offline mode on Windows 8, you need your installation iso / flashdisk drive with the windows installation or windows installation cd, then type this on Command Prompt with admin

Dism /online /enable-feature /featurename:NetFx3 /All /Source:F:\sources\sxs /LimitAccess

type the drive where your windows installation is located, for my case it’s in drive F.

Give it a try 😀