The .NET Framework 2.0 is a version of the .NET Framework, which was released in 2006. It provides a runtime environment for applications built with .NET technologies, such as C#, Visual Basic .NET, and C++/CLI.
Here is why you need the version specifically: net framework 2.0 offline installer 64-bit
: Version 2.0 is not backward compatible with version 1.1, so ensure your specific software specifically asks for "2.0". such as C#