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://mirrors.radwebhosting.com/centos/8.2.2004/isos/x86_64/
http://distro.ibiblio.org/centos/8.2.2004/isos/x86_64/
http://centos.s.uw.edu/centos/8.2.2004/isos/x86_64/
http://mirror.jaleco.com/centos/8.2.2004/isos/x86_64/
http://centos3.zswap.net/8.2.2004/isos/x86_64/
http://mirror.dal.nexril.net/centos/8.2.2004/isos/x86_64/
http://mirror.compevo.com/centos/8.2.2004/isos/x86_64/
http://centos.mirror.constant.com/8.2.2004/isos/x86_64/
http://centos.host-engine.com/8.2.2004/isos/x86_64/
http://repo1.sea.innoscale.net/centos/8.2.2004/isos/x86_64/
http://mirror.pit.teraswitch.com/centos/8.2.2004/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/8.2.2004/isos/x86_64/
http://mirror.us-midwest-1.nexcess.net/CentOS/8.2.2004/isos/x86_64/
http://mirror.arizona.edu/centos/8.2.2004/isos/x86_64/
http://ftpmirror.your.org/pub/centos/8.2.2004/isos/x86_64/
http://centos-distro.1gservers.com/8.2.2004/isos/x86_64/
http://mirror.vcu.edu/pub/gnu_linux/centos/8.2.2004/isos/x86_64/
http://linux.cc.lehigh.edu/centos/8.2.2004/isos/x86_64/
http://centos5.zswap.net/8.2.2004/isos/x86_64/
http://mirror.lax.genesisadaptive.com/centos/8.2.2004/isos/x86_64/
http://mirror.keystealth.org/centos/8.2.2004/isos/x86_64/
http://repo.ialab.dsu.edu/centos/8.2.2004/isos/x86_64/
http://mirror.mia11.us.leaseweb.net/centos/8.2.2004/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/8.2.2004/isos/x86_64/
http://mirrors.rit.edu/centos/8.2.2004/isos/x86_64/
http://mirrors.gigenet.com/centos/8.2.2004/isos/x86_64/
http://mirror.wdc1.us.leaseweb.net/centos/8.2.2004/isos/x86_64/
http://mirror.linux.duke.edu/pub/centos/8.2.2004/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/8.2.2004/isos/x86_64/
http://repo1.ash.innoscale.net/centos/8.2.2004/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Sat Dec 5 09:23:57 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://mirrors.radwebhosting.com/centos/8.2.2004/isos/x86_64/
http://distro.ibiblio.org/centos/8.2.2004/isos/x86_64/
http://centos.s.uw.edu/centos/8.2.2004/isos/x86_64/
http://mirror.jaleco.com/centos/8.2.2004/isos/x86_64/
http://centos3.zswap.net/8.2.2004/isos/x86_64/
http://mirror.dal.nexril.net/centos/8.2.2004/isos/x86_64/
http://mirror.compevo.com/centos/8.2.2004/isos/x86_64/
http://centos.mirror.constant.com/8.2.2004/isos/x86_64/
http://centos.host-engine.com/8.2.2004/isos/x86_64/
http://repo1.sea.innoscale.net/centos/8.2.2004/isos/x86_64/
http://mirror.pit.teraswitch.com/centos/8.2.2004/isos/x86_64/
http://mirror.us.oneandone.net/linux/distributions/centos/8.2.2004/isos/x86_64/
http://mirror.us-midwest-1.nexcess.net/CentOS/8.2.2004/isos/x86_64/
http://mirror.arizona.edu/centos/8.2.2004/isos/x86_64/
http://ftpmirror.your.org/pub/centos/8.2.2004/isos/x86_64/
http://centos-distro.1gservers.com/8.2.2004/isos/x86_64/
http://mirror.vcu.edu/pub/gnu_linux/centos/8.2.2004/isos/x86_64/
http://linux.cc.lehigh.edu/centos/8.2.2004/isos/x86_64/
http://centos5.zswap.net/8.2.2004/isos/x86_64/
http://mirror.lax.genesisadaptive.com/centos/8.2.2004/isos/x86_64/
http://mirror.keystealth.org/centos/8.2.2004/isos/x86_64/
http://repo.ialab.dsu.edu/centos/8.2.2004/isos/x86_64/
http://mirror.mia11.us.leaseweb.net/centos/8.2.2004/isos/x86_64/
http://reflector.westga.edu/repos/CentOS/8.2.2004/isos/x86_64/
http://mirrors.rit.edu/centos/8.2.2004/isos/x86_64/
http://mirrors.gigenet.com/centos/8.2.2004/isos/x86_64/
http://mirror.wdc1.us.leaseweb.net/centos/8.2.2004/isos/x86_64/
http://mirror.linux.duke.edu/pub/centos/8.2.2004/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/8.2.2004/isos/x86_64/
http://repo1.ash.innoscale.net/centos/8.2.2004/isos/x86_64/
+ others, see the full list of mirrors: https://www.centos.org/download/mirrors/
Mirrors verified Sat Dec 5 09:23:57 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