I have been on this insider programme since the day it started and almost every build has installed with little or no problems. That is until build 17040, which would not complete. I tried for the best part of a week, and I did everything known to try and resolve the issue, without success. So I gave up and set the selection to delay for a week. Yesterday the new build 17046 was released and so I went through the exercise of trying to install it. Exactly the same problem as earlier. It goes through phase 1 to 100% in a slightly faster time, it seems to me, and then reboots and does phase 2 to 30% and that takes about 15 seconds, much faster than it used to, then reboots and the next phase is so fast I cannot read what it says. Then it reboots and says it is restoring back to previous operating system. Again I have tried the obvious including using the built in trouble shooter, without success.
I would be interested to know if anyone else is experiencing the same problem and if they have found a cure.