The specific version is the build number for the .NET Framework 4.0. It was released in April 2010 alongside Visual Studio 2010. The number 30319 represents the specific compilation (or "build") of the Common Language Runtime (CLR).
(Note: On the Microsoft page, look for the "Download" button and choose the executable file that matches your system architecture, though the standard file usually handles both x86 and x64.) The specific version is the build number for the
Because you have the "better" offline file, the installation is straightforward. the installation is straightforward.