If your Windows 7 PC is still online (and you have accepted the risks), you can enable the feature via Windows Features.
, ~2.8 MB) that downloads only the necessary components for your 64-bit architecture during installation Security Update for .NET 3.5.1 microsoft net framework 3.5 1 windows 7 64 bit download
: Includes all updates from .NET 2.0 and 3.0, ensuring a broad range of application compatibility. WPF Performance : Significant improvements in Windows Presentation Foundation If your Windows 7 PC is still online