What, if anything, did you do special to get it not to trash your install? I have been trying since they first started coming out and have have to reinstall to recover, of which I guess we can "rollback" now? I even think some of DD1's recommendations not to install these are from me telling him of my issues.
With 10.14.3 all you had to do was boot to the DD1 installer and rerun the Patches. Then it would come right up.
Any assistance will be greatly appreciated and apologies if the process has been covered. I'm kinda brain dead today.
Thank you . . .
. . . fb