Thank you.
I am getting this AFTER it was downloaded and began to "preparing to install".
I only have about 12GB free on my C: drive.
But with 6GB left on my C: drive, it only asked me to free 5GB.
Did this condition still cause the problem?
Well, there was a suggestion during the pre-installation that I can use external drive to install the new build.
Maybe the better option.
Thanks.