Debian 所有版本下载地址
http://cdimage.debian.org/cdimage/archive/

Debian 7 iso 系统下载地址
http://cdimage.debian.org/cdimage/archive/7.11.0/amd64/iso-dvd/debian-7.11.0-amd64-DVD-1.iso

Debian 9 iso 系统下载地址
http://cdimage.debian.org/cdimage/archive/9.13.0/amd64/iso-dvd/debian-9.13.0-amd64-DVD-1.iso

Debian 10 iso 系统下载地址
http://cdimage.debian.org/cdimage/archive/10.2.0/amd64/iso-dvd/debian-10.2.0-amd64-DVD-1.iso

Debian 8 iso 系统下载地址
http://cdimage.debian.org/cdimage/archive/8.11.1/
http://cdimage.debian.org/cdimage/archive/8.11.1/amd64/iso-dvd/
http://cdimage.debian.org/cdimage/archive/8.11.1/amd64/iso-dvd/debian-8.11.1-amd64-DVD-1.iso

centos iso 系统各版本下载地址
https://mirrors.aliyun.com/centos/

win7、win10、win8、Windows Server 2012 R2 等系统 window 系统下载纯净官网地址
https://msdn.itellyou.cn/