Have you run into specific errors installing this? Let me know in the comments below.
These are "empty" versions of the libraries that contain only the metadata. They tell your compiler and Visual Studio which classes and methods are available in .NET 4.5. net framework 45 developer pack link
.NET Framework 4.5, 4.5.1, and 4.5.2 have reached End of Support as of April 26, 2022. Have you run into specific errors installing this
: The reference assemblies required by IDEs like Visual Studio to compile code against the 4.5 API. Language Packs net framework 45 developer pack link