HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Client Look for Version = 4.0.30319.17379 (or higher, but < 4.5)
Since newer versions of .NET (like 4.5 and above) do not support Windows XP, 4.0.3 is often the "ceiling" for the most stable and feature-rich runtime available for those legacy environments. .net framework 4.0.3
The .NET Framework 4.0.3 update is . This means when you install it, it replaces the files of the base .NET 4.0 installation. It is also backwards compatible ; applications designed for .NET 4.0 will continue to work perfectly on 4.0.3. .net framework 4.0.3
Occasionally, third-party libraries or drivers require the specific KB2600211 update to function correctly on older servers. Installation and Compatibility .net framework 4.0.3