Angels have the Phone Box
If you're still an Insider, you've already got it - it came out on the 5th, and put a lot of systems into a perpetual boot loop.
For some, the only answer is an in-place upgrade from w10 to w10, booting from USB/ISO and choosing INSTALL, then selecting to keep all apps and files.
Thanks to Wynona for this link:
Windows 10 cumulative update causes 'reboot loop' havoc for some users | ZDNet