The 4.5 release introduced several critical performance and functional improvements over version 4.0: Asynchronous Programming : Enhanced support for keywords, leading to more responsive user interfaces. Performance

Technical considerations for Windows 7 x64 Windows 7, particularly the 64-bit edition, was widely used in enterprise environments at the time .NET Framework 4.5 was current. Installing the framework on Windows 7 x64 generally required administrator privileges and the presence of certain Windows updates and components. Notably:

A previous failed installation left a mutex lock. Fix:

This is a highly compatible "in-place" update for 4.5 and 4.5.1 and is available at the Microsoft 4.5.2 Offline Installer page Why Use the Offline Installer?

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full Service Pack 1 before you begin?

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