mine has just done that (preview build machine) I think it's done that before, in my experience sometimes it fails to get the next preview build and install it automatically, so it does that. sometimes clearing up enough space on c fixes it, but what i've done before is dl the iso of the most recent build from
https://www.microsoft.com/en-us/soft...iderpreviewiso
14366 is latest, just done
start run winver on my machine and it says 14361.0
I'm a little behind, you're way behind
so I'l dl the iso, mount it, then run the setup from inside windows and it will update, bit of a palava, but it works.
btw, my laptop with retail version is on 10586.420