Requested a call back from Microsoft last evening. A tech finally called me and even he couldn't install this update. A level 2 tech is supposed to call me back on Tues. Is it safe to use this computer without having this update installed?
Lets put it this way, before you even knew about this update (and the subsequent problem) you were happy. Whilst nothing has changed other than this particular update not installing, but some of the others in this cumulative update have. So in theory you are still better protected than when you were before.
As I and many others keep banging about you shouldn't be reliant on things always working and or getting infected; you have to have a robust backup and recovery strategy in place (regular hard drive image backups) to from any such emergency.
I haven't even attempted the latest patch Tuesday update, I have my Windows Update set to a limited paid bandwidth so it doesn't automatically download and install updates. I usually wait at least a week before manually updating and monitor such issues in the meantime.
Technically this win10 laptop is less well protected (in regard of these updates) than yours, but I'm still using it, reasonably secure in the knowledge I have my backup strategy in place. Speaking of which I'm just about to run my weekly drive image backup.