Microsoft .NET Framework 3.5 Offline Installer is a DISM front-end interface for installing .NET Framework 3.5 Offline using /souces/sxs from the Windows Installation media as medium. Intended for Windows 8 to up.
This tool might comes in handy for those living in areas where Internet access is low and scarce. This tool is a good alternative to the download first and install off-line next technique.
.NET Framework 3.5 Installer uses the Deployment Image Servicing and Management (DISM.exe) to locate and install .NET Framework 3.5 from the Windows installation medium.