For .NET Framework 4.5.1 specifically, the official Microsoft Developer Pack installer may work on Windows 10 and 11, though this is not guaranteed on the newest systems.
Microsoft has consolidated many older developer packs. You can find the official installers through the or the .NET Download Archives . Official Archive: Download .NET Framework 4.5
If you are maintaining legacy applications or working in an environment stuck on an older toolchain (like Visual Studio 2012 or 2013), you have probably searched for the . net framework 45 developer pack link
[Current Date] Category: Development Tools / .NET
Migration and maintenance guidance
versions as they offer better compatibility and more recent updates. .NET Framework 4.5.2 Developer Pack
Conclusion The .NET Framework 4.5 Developer Pack is a targeted distribution of reference assemblies, documentation, and developer tools that enable building and compiling applications specifically for .NET Framework 4.5. While essential for maintaining or creating applications that must target that older framework, developers should weigh the benefits of compatibility against the security and feature advantages of migrating to newer, supported frameworks. To obtain the pack, use Microsoft's Download Center or the Visual Studio Installer and ensure build environments include the pack for consistent compilation. Official Archive: Download
If you are maintaining legacy code, consider upgrading the target version to , which offer better security compliance and modern OS compatibility. For entirely new greenfield projects, transition away from the legacy .NET Framework entirely and adopt modern .NET 8 or .NET 9 , which provide cross-platform capabilities and vastly superior performance.