If the setup fails, try the following steps recommended by the Microsoft Answers community:
Windows 7 SP1, Windows Server 2008 R2 SP1, Windows Server 2012, and Windows Vista SP2. dotnetfx45_full_setup
It replaces version 4.0 while remaining compatible with applications targeting the older version. If the setup fails, try the following steps
The executable is the redistributable package for Microsoft .NET Framework 4.5. It is a highly compatible, "in-place" update to version 4.0, providing the essential runtime environment for Windows-based applications built with C#, F#, or Visual Basic. Key Features of .NET Framework 4.5 If the setup fails