when I try to install github-windows on my PC, got such error "lower .NET Framework Version" :
Prerequisite check for system component Microsoft .NET Framework 4.5 (x86 and x64) failed with the following error message: "Installation of the Microsoft .NET Framework 4.5 is not supported on this operating system. Contact your application vendor."
regedit->HKEYLOCALMACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5
refer to 如何确定已安装的 Microsoft .NET Framework 版本和 Service Pack 级别
or just check "Add or Remove Programe" Panel,
before download v4.5, you‘d better check you environments:
Supported Operating System Windows 7 Service Pack 1, Windows Server 2008 R2 SP1, Windows Server 2008 Service Pack 2, Windows Vista Service Pack 2 Windows Vista SP2 (x86 and x64) Windows 7 SP1 (x86 and x64) Windows Server 2008 R2 SP1 (x64) Windows Server 2008 SP2 (x86 and x64) Hardware Requirements: 1 GHz or faster processor 512 MB of RAM 850 MB of available hard disk space (x86) 2 GB hard drive (x64)
maybe it‘s why github-windows just support Windows Vista, 7, 8, & 8.1 ,check it https://github.com/
official download .net framework v4.5
how to identify your .NET Framework version,布布扣,bubuko.com
how to identify your .NET Framework version
原文：http://www.cnblogs.com/phpgcs/p/how-to-identify-your-NET-Framework-version.html