I am unable to install this update. First, I had the supplemental update showing up *another time* in the Appstore update section after the *first update.* This happened to my MBP as well. The MBP did the actual update after doing the procedure for the 2nd time, however my Hack is still stuck at 17D47! There were no actual error messages I could see (like others posted). Then I tried to do a manual update using the standalone installer. Still, I am stuck at 17D47, and in addition I now see a Folder called "macOS Install Data" at the root of my boot drive. Even removing this folder and updating again has no effect. Plus I do not see the update in the Appstore anymore.
WTF? Any ideas?