This build installed fine on my main Dev PC. However, installing it on the second Dev, using the ISO created from the first, had a problem. Only got as far as the desktop, where I was greeted with a black screen, with a partially filled taskbar flashing on and off. The only response I got was from ctr+alt+delete. Managed to change user, which appeared without any problems, Reboot had no effect.
So, eventually used "go back to previous version". This took a long time, but got me back eventually.
Will try again, using the normal WU
The second try via WU installed without any problems, as did the Hyper-V dev install