High Sierra Supplemental Update not loading

[bedouin]

This is a strange one.... I have a late 2012, 27" iMac, 2.9GHz, 16GB Ram, with 785 GB available on the HDD and running 10.13.3 which I updated on 1.31.18.

In February I did the supplemental update and since then at least 5 more times.

I updated when it first came out and everything seemed to go just fine and then my auto update requested it again a few days later. Thinking maybe I missed something I did it again. Everything updated just fine once again. But then a few days later auto update asked for it one more time... so I look at about this Mac and it is not really updating, it still shows 10.13.3.

If I go to Software updates after the supplemental update, it shows no updates available. Then a few days later it pops back up.

I have run disk utiltiy and hardware test and it all comes back normal.

Anyone have any thoughts?

TIA... Matthew

[ka jowct]

Any particular reason you installed High Sierra?

I’ve been seeing reports of problems like the one you are describing. You might find some info at Macintouch.

[pipiens]

you are not alone

https://macperformanceguide.com/

''Today I installed the macOS 10.13.3 Supplemental Update.

Upon reboot the system demanded that macOS be reinstalled (“this version of macOS has to be reinstalled”).
After reinstalling macOS, then it wanted to install macOS 10.13.3 Supplemental Update.
After installing the supplemental update, it demanded that macOS be reinstalled.
= infinite reinstall/update/reinstall/update/reinstall/update/.../ad-nauseum

Maybe this is iMac Pro specific—the new wonderful secure enclave manure anti-feature. The App Store updates window shows that the macOS 10.13.3 Supplemental Update has now been installed 3 times (and counting), as shown below.

See reader comments further below—I’m not the only one who has experienced this issue.
Clean slate does not fix it

Booting into recovery mode, I erased the boot volume with Disk Utility for a totally clean-slate reinstall. Upon reinstall, the same infinite loop results. So I basically have an about $11200 paperweight on my desk, at least until Apple issues macOS HighSierra 10.13.4 and that might not fix it".