Since you are not saving anything there is no need for all the gyrations we went through before. All you need to do is...
  1. Shut down your computer completely
  2. Press the power button then hold Option+Command+R (⌥⌘R) until you see a rotating globe icon to boot from the Internet Recovery Drive.
  3. If prompted, enter the password for your account on the computer you are upgrading
  4. If prompted, click at the far right end of the menu bar to select your network and enter your network password
  5. When the Internet Recovery Drive completes booting, select the option to Upgrade/Install MacOS. This will install the latest version of MacOS that is compatible with your computer
  6. Follow the on screen instuctions. Your computer will download the update and install it. Your computer will reboot multiple times during the installation so don't get anxious, don't unplug, don't restart, until you see the logon screen and you are "good to go".

Last edited by joemikeb; 10/02/20 09:25 PM. Reason: fat fingers
If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein