Hangs up at 85% while "Preparing macOS Catalina 10.15.2 Developer Beta...". Times out with the message "An internet connection is required to install macOS."
I have connected both wirlessly and wired to a solid 250Mbps connection, but the update times out every time. The internet connection is open and stable. Rebooted, ran Disk Utility, but nothing has corrected this hangup.