Windows 7 reached on January 14, 2020. This means Microsoft no longer provides security updates for the OS itself. However, .NET Framework 4.0.3019 is also legacy, and running it connected to the internet carries risks:
Once the download is complete, follow these steps to install .NET Framework 4.0 on Windows 7:
Compatibility: Specifically optimized for the Windows 7 Service Pack 1 architecture. How to Ensure a High-Quality Installation To get the best results on Windows 7, follow these steps: