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.dal.nexril.net/centos/8.2.2004/isos/aarch64/
http://yum.tamu.edu/centos/8.2.2004/isos/aarch64/
http://mirror.compevo.com/centos/8.2.2004/isos/aarch64/
http://mirrors.tummy.com/mirrors/CentOS/8.2.2004/isos/aarch64/
http://mirror.jaleco.com/centos/8.2.2004/isos/aarch64/
http://mirror.vtti.vt.edu/centos/8.2.2004/isos/aarch64/
http://mirrors.advancedhosters.com/centos/8.2.2004/isos/aarch64/
http://centos5.zswap.net/8.2.2004/isos/aarch64/
http://mirror.genesishosting.com/centos/8.2.2004/isos/aarch64/
http://mirror.cogentco.com/pub/linux/centos/8.2.2004/isos/aarch64/
http://centos.mirror.lstn.net/8.2.2004/isos/aarch64/
http://repos.lax.quadranet.com/centos/8.2.2004/isos/aarch64/
http://mirror.atlanticmetro.net/centos/8.2.2004/isos/aarch64/
http://mirror.oss.ou.edu/centos/8.2.2004/isos/aarch64/
http://mirror.es.its.nyu.edu/centos/8.2.2004/isos/aarch64/
http://mirror.shastacoe.net/centos/8.2.2004/isos/aarch64/
http://centos-distro.cavecreek.net/centos/8.2.2004/isos/aarch64/
http://mirror.teklinks.com/centos/8.2.2004/isos/aarch64/
http://centos.mirrors.tds.net/pub/linux/centos/8.2.2004/isos/aarch64/
http://mirrors.umflint.edu/CentOS/8.2.2004/isos/aarch64/
http://mirror.sfo12.us.leaseweb.net/centos/8.2.2004/isos/aarch64/
http://repos.lax.layerhost.com/centos/8.2.2004/isos/aarch64/
http://sjc.edge.kernel.org/centos/8.2.2004/isos/aarch64/
http://mirrors.rcs.alaska.edu/centos/8.2.2004/isos/aarch64/
http://repos.dfw.quadranet.com/centos/8.2.2004/isos/aarch64/
http://mirror.pit.teraswitch.com/centos/8.2.2004/isos/aarch64/
http://mirror.sjc02.svwh.net/centos/8.2.2004/isos/aarch64/
http://distro.ibiblio.org/centos/8.2.2004/isos/aarch64/
http://mirror.chpc.utah.edu/pub/centos/8.2.2004/isos/aarch64/
http://ftp.ussg.iu.edu/linux/centos/8.2.2004/isos/aarch64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Sat Dec 5 09:23:48 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
The following mirrors should have the ISO images available:
http://mirror.dal.nexril.net/centos/8.2.2004/isos/aarch64/
http://yum.tamu.edu/centos/8.2.2004/isos/aarch64/
http://mirror.compevo.com/centos/8.2.2004/isos/aarch64/
http://mirrors.tummy.com/mirrors/CentOS/8.2.2004/isos/aarch64/
http://mirror.jaleco.com/centos/8.2.2004/isos/aarch64/
http://mirror.vtti.vt.edu/centos/8.2.2004/isos/aarch64/
http://mirrors.advancedhosters.com/centos/8.2.2004/isos/aarch64/
http://centos5.zswap.net/8.2.2004/isos/aarch64/
http://mirror.genesishosting.com/centos/8.2.2004/isos/aarch64/
http://mirror.cogentco.com/pub/linux/centos/8.2.2004/isos/aarch64/
http://centos.mirror.lstn.net/8.2.2004/isos/aarch64/
http://repos.lax.quadranet.com/centos/8.2.2004/isos/aarch64/
http://mirror.atlanticmetro.net/centos/8.2.2004/isos/aarch64/
http://mirror.oss.ou.edu/centos/8.2.2004/isos/aarch64/
http://mirror.es.its.nyu.edu/centos/8.2.2004/isos/aarch64/
http://mirror.shastacoe.net/centos/8.2.2004/isos/aarch64/
http://centos-distro.cavecreek.net/centos/8.2.2004/isos/aarch64/
http://mirror.teklinks.com/centos/8.2.2004/isos/aarch64/
http://centos.mirrors.tds.net/pub/linux/centos/8.2.2004/isos/aarch64/
http://mirrors.umflint.edu/CentOS/8.2.2004/isos/aarch64/
http://mirror.sfo12.us.leaseweb.net/centos/8.2.2004/isos/aarch64/
http://repos.lax.layerhost.com/centos/8.2.2004/isos/aarch64/
http://sjc.edge.kernel.org/centos/8.2.2004/isos/aarch64/
http://mirrors.rcs.alaska.edu/centos/8.2.2004/isos/aarch64/
http://repos.dfw.quadranet.com/centos/8.2.2004/isos/aarch64/
http://mirror.pit.teraswitch.com/centos/8.2.2004/isos/aarch64/
http://mirror.sjc02.svwh.net/centos/8.2.2004/isos/aarch64/
http://distro.ibiblio.org/centos/8.2.2004/isos/aarch64/
http://mirror.chpc.utah.edu/pub/centos/8.2.2004/isos/aarch64/
http://ftp.ussg.iu.edu/linux/centos/8.2.2004/isos/aarch64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Sat Dec 5 09:23:48 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