Check .

Once you have the microsoftwindowsnetfx3ondemandpackagecab stored locally (e.g., C:\Temp\NetFX3\ ), you have three reliable installation methods.

Proceed to the page and check .NET Framework 3.5 Features .

:If you have the .cab file or the entire sxs folder copied to C:\NetFx3 , run this command in an Elevated Command Prompt :