If for some reason you cannot get the official CAB, there are two legacy methods:
The Microsoft Windows .NET Framework 3.0 On Demand Package is a software package that provides a set of components and libraries for developing and running Windows-based applications. Specifically, this package includes the .NET Framework 3.0, which is a major update to the .NET Framework that adds new features and improvements. microsoftwindowsnetfx3ondemandpackagecab extra free
The file arrived: microsoft-windows-netfx3-ondemand-package.cab . If for some reason you cannot get the
If you've been hitting a wall trying to install .NET 3.5 through "Windows Features," you aren't alone. Errors often happen when Windows can’t reach the update servers. The secret? Use the official file. Where to find it for free: microsoftwindowsnetfx3ondemandpackagecab extra free