2021年10月28日准备下载, Centos8.0.1905,

https://mirrors.aliyun.com/centos/8.0.1905/

这个链接中, 只有一个 readme, 内容是

This directory (and version of CentOS) is deprecated. For normal users,
you should use /8/ and not /8.0.1905/ in your path. Please see this FAQ
concerning the CentOS release scheme:

https://wiki.centos.org/FAQ/General

If you know what you are doing, and absolutely want to remain at the 8.0.1905
level, go to http://vault.centos.org/ for packages.

Please keep in mind that 8.0.1905 no longer gets any updates, nor
any security fix's.

可以知道, 下载老版本的地址 http://vault.centos.org

也可以在 https://developer.aliyun.com/mirror/centos 这个文档中, 找到老版本的下载地址

https://mirrors.aliyun.com/centos-vault/

总结, Centos老版本下载地址

1, https://mirrors.aliyun.com/centos-vault/

2, http://vault.centos.org