The .NET Framework 4.5 Developer Pack (also known as the Targeting Pack) is an essential set of components for software developers who need to build, compile, and debug applications that target the 4.5 version of the framework. While the runtime allows a computer to run 4.5 apps, the developer pack is what allows Visual Studio to create them. Direct Download Links
Download .NET Framework 4.5.1 Developer Pack: If your project strictly requires the 4.5.1 branch, you can obtain it from the official Microsoft Download Center.
The following official links lead to the Microsoft Download Center for the different iterations of the 4.5 series: net framework 45 developer pack link
Direct download links for the .NET Framework 4.5 Developer Pack are essentially no longer available as a standalone package for the base 4.5 version because it reached its end of support on January 12, 2016.
What it is
Download .NET Framework 4.5.2 Developer Pack: This is the recommended alternative for legacy 4.5 apps. It installs the multi-targeting pack for 4.5 and is available on the Microsoft Download Center.
This article breaks down what it is, why you need it, and how to get your environment set up. What is the .NET Framework 4.5 Developer Pack? Download
Looking for the .NET Framework 4.5 Developer Pack? While Version 4.5 reached its end of life on April 26, 2022, developers often still need it to maintain legacy applications or compile older projects in Visual Studio.