Instaler have problem with downloading some stuff from mirrors.antergos.com
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We are experiencing some server downtime. Our provider is working to resolve the issue ASAP. If you would like to install right away you can do so by enabling one of the backup mirrors. Simply open terminal and use su to run “nano /etc/pacman.d/antergos-mirrorlist” Then just comment out the first server and uncomment one of the backups. I tested them and they are working. Sorry for the trouble!