on the official Microsoft Download Center. It is usually extracted to a temporary folder during a .NET Framework installation. Microsoft Learn Offline Installer : Download the Microsoft .NET Framework 4 (Standalone Installer) or a later version like Extraction
How to install
This update was released to address performance and reliability issues within the .NET Framework 3.5.1 subsystem, a crucial component for legacy application support in the Windows ecosystem. Download Windows6.1-kb958-488-v6001-x64.msu
The .msu (Microsoft Update) extension signifies a self-contained cabinet file that wraps several components required for the Windows Update Agent. Unlike a standard executable installer, an .msu file is structurally a cabinet archive containing the following elements: on the official Microsoft Download Center