: This package (dotNetFx40_Full_x86_x64.exe) contains everything needed to run existing applications built with .NET Framework 4.0 on both 32-bit and 64-bit systems. Microsoft .NET Framework 4 (Web Installer)
Thus, the free and safe “link” is not to a suspicious third-party site hosting “v4.0.3.19.exe,” but rather to Microsoft’s official download page for . Alternatively, if an application strictly needs the older 4.0.x runtime, the correct sequence is: : This package (dotNetFx40_Full_x86_x64