根据操作系统选择32或64位版本，如下：
CurrentCygwin DLL version
Themost recent version of the Cygwin DLL is 1.7.33. Install it byrunning setup-x86.exe (32-bit installation) or setup-x86_64.exe (64-bit installation).
Usethe setup program to perform a fresh install or to update an existing installation.
Notethat individual packages in the distribution are updated separately from theDLL so the Cygwin DLL version is not useful as a general Cygwin release number.
选择从Internet上安装
选择根目录
选择安装包放置路径
网络为代理的话需要配置代理服务器地址和端口
选择镜像源
选择需要安装的组件pip、git、vim、curl、ssh、wget
开始下载安装