For those few also having issues updating from RP channel I figured out a fix, this is from my post on reddit:
"I figured out a fix for the issue, I restored my system to the restore point before installing the latest RP release (22621.169), this brought me back to 22621.160. After Windows...
The update doesn't seem to like me, I keep getting an error (0x800f081f).
EDIT: For some reason the update gets to about 10% downloaded and tries to install.
Release notes state:
The build watermark at the lower right-hand corner of the desktop is no longer present in this build. This doesn’t mean we’re done, and the watermark will return to Insiders in a future build
Hmm, keeps saying "Pending Restart" in WU, I click it, my computer reboots like normal and alas same message in WU. Strange..
e/ Updated! I scheduled a reboot to update thru WU and it kicked right off!