On my 6,2 MBP, I used system update to upgrade from 10.14.4 to 10.14.5. The installation went ahead and restarted automatically where it got stuck. I then used restarted to the startup disk created by Mojave Patcher 1.3.1 and applied patches, after restart this led to a dark screen with a small spinning gear which was also stuck in a loop.
I am now downloading the whole OS using Mojave Patcher 1.3.2, I assume it will download 10.14.5, it does not say which version it is downloading, it is over 6 GB.
It is a pain in in the neck to keep downloading the whole OS every time there is a new patcher update.
I do not know why my installation was stuck with a screen with spinning gear. The same happened when upgrading to 10.14.4, but I know that for that version a new startup disk was required. However, the docs say that for 10.14.5 that is not required... well that did not work for me.
Also, yesterday, patch updater asked to update the legacy video stuff, said it will fix random kernel panics. I updated that on 10.14.4, which broke my screen brightness. The brightness control is completely gone in system preferences and controlling brightness by keyboard does not work either. I am stuck with a dim screen. Does this get resolved after upgrading to 10.14.5?
Apple is doing a good job to make us on unsupported hardware more and more frustrated to give up and buy new hardware. Joke's on you Apple, I won't be buying another mac given the new bugs for (the completely unneeded) new keyboard and some screen nightmare. If it wasn't for security reasons, would never update from El Capitan.