I had previously configured the App Store to download updates but wait for me to install them. It looks like it successfully downloaded the macOS Sierra Public Beta 3 update to /Library/Updates/031-69393/ and then the App Store requested that I install it. When I said yes to install, App Store went to Installing but then hangs at "0 bytes of 2.05 GB -- Calculating.." After a while, I Quit that, rebooted, and then tried: sudo softwareupdate -i "macOS Sierra Public Beta-3" --verbose --force and I saw no activity using task manager. After a while, I moved the /Library/Updates/031-69393/ to /tmp, rebooted and tried again all of the above. No dice. Hangs at 0 or at "Installing -- Calculating.." in App Store. Also tried App Store Check for Unfinished Downloads of which there were none. Any advice?