Ensure you are using a Visual Studio version that supports older targeting packs. Open the Visual Studio Installer , go to Individual Components , scroll down to the .NET section, and ensure that the .NET Framework 4.5 targeting pack check box is ticked. 3. Blocked Installation on Modern Windows OS

A: Support for .NET Framework 4.5 ended on January 12, 2016. Microsoft no longer provides direct downloads for out-of-support versions, directing developers to upgrade to supported versions instead.

Visual Studio 2022 and later versions by default. As Microsoft documentation states, "Visual Studio 2022 and later versions can't build apps that target .NET Framework 4.0 through .NET Framework 4.5.1".

The official, safest method to obtain the developer pack is through the or the Visual Studio Older Downloads archive.

The core environment needed to execute the application on the development machine. Important Support Status

If you are maintaining a code base built on this version, you are likely utilizing several of its foundational features. Version 4.5 was a milestone release that introduced: Asynchronous Programming (Async/Await)

To ensure security and stability, you should always download development tools directly from official Microsoft repositories. microsoft.com

.NET Framework 4.5 Developer Pack (now typically delivered via the 4.5.2 version) is a single package that allows developers to build applications targeting .NET Framework 4.5 using tools like Visual Studio. Direct Download Links The official download locations from the Microsoft Download Center .NET Framework 4.5.2 Developer Pack