In order to conserve the limited bandwidth available, ISO images are not downloadable from mirror.centos.org
The following mirrors should have the ISO images available:
http://mirror.atl.genesisadaptive.com/centos/8.5.2111/isos/aarch64/
http://mirror.net.cen.ct.gov/centos/8.5.2111/isos/aarch64/
http://mirrors.rit.edu/centos/8.5.2111/isos/aarch64/
http://mirrors.oit.uci.edu/centos/8.5.2111/isos/aarch64/
http://repos.eggycrew.com/centos/8.5.2111/isos/aarch64/
http://repos.hou.layerhost.com/centos/8.5.2111/isos/aarch64/
http://mirror.genesisadaptive.com/centos/8.5.2111/isos/aarch64/
http://mirror.centos.iad1.serverforge.org/8.5.2111/isos/aarch64/
http://mirrors.xtom.com/centos/8.5.2111/isos/aarch64/
http://mirror.umd.edu/centos/8.5.2111/isos/aarch64/
http://mirror.dal.nexril.net/centos/8.5.2111/isos/aarch64/
http://centos.s.uw.edu/centos/8.5.2111/isos/aarch64/
http://mirror.nodesdirect.com/centos/8.5.2111/isos/aarch64/
http://mirrors.mit.edu/centos/8.5.2111/isos/aarch64/
http://mirror.phx1.us.spryservers.net/centos/8.5.2111/isos/aarch64/
http://yum.tamu.edu/centos/8.5.2111/isos/aarch64/
http://mirror.us-midwest-1.nexcess.net/CentOS/8.5.2111/isos/aarch64/
http://mirror.cs.pitt.edu/centos/8.5.2111/isos/aarch64/
http://mirror.pit.teraswitch.com/centos/8.5.2111/isos/aarch64/
http://mirror.teklinks.com/centos/8.5.2111/isos/aarch64/
http://mirror.fileplanet.com/centos/8.5.2111/isos/aarch64/
http://mirrors.cmich.edu/centos/8.5.2111/isos/aarch64/
http://repos.forethought.net/centos/8.5.2111/isos/aarch64/
http://ftp.osuosl.org/pub/centos/8.5.2111/isos/aarch64/
http://mirror.us.oneandone.net/linux/distributions/centos/8.5.2111/isos/aarch64/
http://mirror.sfo12.us.leaseweb.net/centos/8.5.2111/isos/aarch64/
http://mirror.mia.velocihost.net/centos/8.5.2111/isos/aarch64/
http://mirror.jaleco.com/centos/8.5.2111/isos/aarch64/
http://mirrors.seas.harvard.edu/centos/8.5.2111/isos/aarch64/
http://mirrors.gigenet.com/centos/8.5.2111/isos/aarch64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Mon Jan 31 08:39:01 2022 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
The following mirrors should have the ISO images available:
http://mirror.atl.genesisadaptive.com/centos/8.5.2111/isos/aarch64/
http://mirror.net.cen.ct.gov/centos/8.5.2111/isos/aarch64/
http://mirrors.rit.edu/centos/8.5.2111/isos/aarch64/
http://mirrors.oit.uci.edu/centos/8.5.2111/isos/aarch64/
http://repos.eggycrew.com/centos/8.5.2111/isos/aarch64/
http://repos.hou.layerhost.com/centos/8.5.2111/isos/aarch64/
http://mirror.genesisadaptive.com/centos/8.5.2111/isos/aarch64/
http://mirror.centos.iad1.serverforge.org/8.5.2111/isos/aarch64/
http://mirrors.xtom.com/centos/8.5.2111/isos/aarch64/
http://mirror.umd.edu/centos/8.5.2111/isos/aarch64/
http://mirror.dal.nexril.net/centos/8.5.2111/isos/aarch64/
http://centos.s.uw.edu/centos/8.5.2111/isos/aarch64/
http://mirror.nodesdirect.com/centos/8.5.2111/isos/aarch64/
http://mirrors.mit.edu/centos/8.5.2111/isos/aarch64/
http://mirror.phx1.us.spryservers.net/centos/8.5.2111/isos/aarch64/
http://yum.tamu.edu/centos/8.5.2111/isos/aarch64/
http://mirror.us-midwest-1.nexcess.net/CentOS/8.5.2111/isos/aarch64/
http://mirror.cs.pitt.edu/centos/8.5.2111/isos/aarch64/
http://mirror.pit.teraswitch.com/centos/8.5.2111/isos/aarch64/
http://mirror.teklinks.com/centos/8.5.2111/isos/aarch64/
http://mirror.fileplanet.com/centos/8.5.2111/isos/aarch64/
http://mirrors.cmich.edu/centos/8.5.2111/isos/aarch64/
http://repos.forethought.net/centos/8.5.2111/isos/aarch64/
http://ftp.osuosl.org/pub/centos/8.5.2111/isos/aarch64/
http://mirror.us.oneandone.net/linux/distributions/centos/8.5.2111/isos/aarch64/
http://mirror.sfo12.us.leaseweb.net/centos/8.5.2111/isos/aarch64/
http://mirror.mia.velocihost.net/centos/8.5.2111/isos/aarch64/
http://mirror.jaleco.com/centos/8.5.2111/isos/aarch64/
http://mirrors.seas.harvard.edu/centos/8.5.2111/isos/aarch64/
http://mirrors.gigenet.com/centos/8.5.2111/isos/aarch64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Mon Jan 31 08:39:01 2022 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