https://www.anaconda.com/distribution/#download-section 官网下载地址
https://mirror.tuna.tsinghua.edu.cn/help/anaconda/ Anaconda 镜像使用帮助
https://repo.anaconda.com/archive/Anaconda2-2019.07-Windows-x86_64.exe 64bit for Python 2.7 version，使用IDM下载即可
https://repo.anaconda.com/archive/Anaconda3-2019.07-Windows-x86_64.exe 64bit for Python 3.7 version ，使用IDM下载即可