Cubase 8.5.15 installer deleted the program!

I am normally a very nice and polite person, but now I am cursing and swearing YOUR name. Downloaded the updater to update my Cubase to 8.5.15. It ran about 10% of the status bar, then prompted me to reboot now or reboot manually later. I choose later. Guess what happened? It rebooted instantly. Well, I could live with that, but what more baffling and strange was that when it started again it did not resume the installer AND Cubase 8.5 was totally removed from my computer. What the fuck is this? I selected UPDATE, not delete, and certainly not “DELETE IT ALL WITH MY PROJECTS”. This really mad me mad!