In order to conserve the limited bandwidth available, ISO images are not downloadable from mirror.centos.org

http://mirror.cogentco.com/pub/linux/centos/8.0.1905/isos/aarch64/
http://centos4.zswap.net/8.0.1905/isos/aarch64/
http://repo1.ash.innoscale.net/centos/8.0.1905/isos/aarch64/
http://us.mirror.nsec.pt/centos/8.0.1905/isos/aarch64/
http://mirror.cs.vt.edu/pub/CentOS/8.0.1905/isos/aarch64/
http://mirror.ash.fastserv.com/centos/8.0.1905/isos/aarch64/
http://mirrors.advancedhosters.com/centos/8.0.1905/isos/aarch64/
http://repos-va.psychz.net/centos/8.0.1905/isos/aarch64/
http://mirror.vtti.vt.edu/centos/8.0.1905/isos/aarch64/
http://mirror.vcu.edu/pub/gnu_linux/centos/8.0.1905/isos/aarch64/

http://mirrors.tummy.com/mirrors/CentOS/8.0.1905/isos/aarch64/
http://mirrors.rit.edu/centos/8.0.1905/isos/aarch64/
http://mirror.millry.co/CentOS/8.0.1905/isos/aarch64/
http://mirror.twinlakes.net/centos/8.0.1905/isos/aarch64/
http://mirrors.seas.harvard.edu/centos/8.0.1905/isos/aarch64/
http://mirrors.usc.edu/pub/linux/distributions/centos/8.0.1905/isos/aarch64/
http://repos.lax.quadranet.com/centos/8.0.1905/isos/aarch64/
http://mirrors.unifiedlayer.com/centos/8.0.1905/isos/aarch64/
http://mirror.steadfastnet.com/centos/8.0.1905/isos/aarch64/
http://repo1.sea.innoscale.net/centos/8.0.1905/isos/aarch64/
http://mirror.datto.com/CentOS/8.0.1905/isos/aarch64/
http://mirror.fileplanet.com/centos/8.0.1905/isos/aarch64/
http://ftpmirror.your.org/pub/centos/8.0.1905/isos/aarch64/
http://mirrors.tripadvisor.com/centos/8.0.1905/isos/aarch64/
http://mirrors.maine.edu/CentOS/8.0.1905/isos/aarch64/
http://sjc.edge.kernel.org/centos/8.0.1905/isos/aarch64/
http://mirror.nodesdirect.com/centos/8.0.1905/isos/aarch64/
http://mirror.net.cen.ct.gov/centos/8.0.1905/isos/aarch64/
http://mirror.cc.columbia.edu/pub/linux/centos/8.0.1905/isos/aarch64/
http://mirror.web-ster.com/centos/8.0.1905/isos/aarch64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/

Mirrors verified Tue Jan 14 17:47:19 2020 UTC

You can also download the ISO images using bittorrent, a peer-to-peer file sharing protocol. The .torrent files can be found from CentOS mirrors. Various bittorrent clients are available, including (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission. Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article: https://wiki.centos.org/AdditionalResources/Repositories