An error occurred attempting to install GitHub

安装GitHub桌面版的时候报错
An error occurred attempting to install GitHub.
解决思路：
Details中告诉我们了可以在install.log这个日志文件看到更多的信息，那我们就去看看。开打发现最后是这样的话：
‘Windows Installer 4.5‘ RunCheck result: No Install Needed
Launching Application.
URLDownloadToCacheFile failed with HRESULT ‘-2146697208‘
Error: An error occurred trying to download ‘http://github-windows.s3.amazonaws.com/GitHub.application‘.
Windows Installer 4.5？windows软件安装工具4.5版本？先不管
继续向下看发现了有用的信息，如下：
Running checks for package ‘Microsoft .NET Framework 4.5 (x86 and x64)‘, phase BuildList.......
‘Microsoft .NET Framework 4.5 (x86 and x64)‘ RunCheck result: No Install Needed Running checks for package ‘Windows Installer 4.5‘, phase BuildList
原来是Microsoft .NET Framework 4.5 安装失败了，而它需要这个.NET 4.5版本。(难道是用C#写的？)
那就安装一下
已经有了....什么情况？
然后去百度找解决办法，运气不错，找到了：
Try running the following command as an administrator:
%SYSTEMROOT%\SYSTEM32\REGSVR32.EXE
%SYSTEMROOT%\SYSTEM32\WUAUENG.DLL
注意是as an administrator
重新运行github的安装包，终于安装好了