the package you requested is not authorized for download, or similar.
Try this link - http://cdimage.ubuntu.com/ubuntu-mate/daily-live/20180403.1/bionic-desktop-amd64.iso
All the links for the beta seems broken on the download page, but there is a beta 2 that works: http://cdimage.ubuntu.com/ubuntu-mate/releases/18.04/beta-2/.
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Thanka mdooley and BenignBeppe! I was able to grab a .torrent file from there and got it that way!