I have:
MacBook Pro (Retina, 15-inch, Mid 2015)
I tried to update to macos 10.14.1 but software update says there aren't any updates. I then downloaded the update from:
https://support.apple.com/kb/DL1981?locale=en_US
and tried to install it, but the Disk has a yellow triangle with exclamation point and says:
macos 10.14.1 update can't be installed on this disk. This volume does not meet the requirements for this update.
I have filevault turned on. Was this update not tested on a system with disk encryption turned on?
I also has the same issue. Have you solve it ? wj@usu