B.21277.1000 installed with no problems in my 64 bit PC.
faster than usual DL & install.
Just the opposite on my fast PC. Normal DL, but very slow install. Hung at 18% install before the first reboot, took at least 5 minutes before rebooting eventually. Another 2 reboots after that, where it normally doesn't reboot again, where it goes from 45% to finish. Started at 0% this time.
All else ok after that