Applications compiled under .NET 4.5 will naturally run on systems equipped with .NET Framework 4.8 or 4.8.1 because the 4.x runtime ecosystem is highly backward-compatible. However, for new projects, it is highly recommended to build using the latest Modern .NET (Core) frameworks to take advantage of cross-platform capabilities on Linux and macOS.
Whenever budgets and timelines allow, it is highly recommended to migrate your projects from .NET 4.5 to at least or the modern open-source .NET 8/9 platform to ensure continuous security patches, superior performance, and cross-platform capabilities.
Navigate to the following subkey pathway: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full Look for a REG_DWORD value named Release . microsoft .net framework 4.5 developer pack download
This provides the necessary reference assemblies, allowing Visual Studio to build projects targeting .NET Framework 4.5.
.NET 8 / .NET 9 (For modern, open-source, cross-platform cloud apps) Applications compiled under
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The .NET Framework 4.5 reached its official end of support lifecycle in January 2016. Security patches and technical updates are no longer provided for this specific version. If you are starting a brand-new project, you should avoid targeting .NET 4.5. This link or copies made by others cannot be deleted
The remains a critical tool for legacy development environments. While modern development has moved to newer, cross-platform frameworks, the stability and features of .NET 4.5 (async/await, WCF improvements, WPF enhancements) made it a cornerstone of Windows development history.
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(Note: Modern operating systems like Windows 11 ship with newer default versions of the framework, such as .NET 4.8. These newer engines are fully backward-compatible with 4.5 compiled code, but the targeted developer pack is still required if you must compile explicitly for 4.5 [) . Step-by-Step: How to Download and Install