High Sierra update 10.13.3 won't install

I have been through the download, install & reboot process several times but the install doesn't work and I am still on 10.13.2. I can see the download happening and then the system reboots but then the App Store shows the update is still waiting to download and install. Feels like Groundhog Day!

iMac 5k Retina 27in late 2015. Any ideas?

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iMac with Retina 5K display

Posted on Jan 24, 2018 3:00 AM

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Posted on Jan 24, 2018 4:52 AM

Update: Problem solved by disabling Bitdefender (antivirus software). System installed ok and re-enabled Bitdefender and all working just fine. Interesting though this is the first time an update has been stalled even though I have had Bitdefender on my MAC for over a year. Will see what happens next time an update is issued.

45 replies

Mar 13, 2018 4:39 AM in response to bwilliams83

Q: Did you solve the issue?


I have the same issue until today. Currently on 10.13.2 (17C88), update 10.13.3 won't install.

Tried all of this:

- Traditional install via App Store update notification

- Traditional install via App Store update notification (with AV Bitdefender deactivated)

- Traditional install via App Store update notification (with AV Bitdefender completely uninstalled)

- Manual download update file from Apple site (with AV Bitdefender completely uninstalled)


I'm still on 10.13.2 (17C88)

Every time the install starts. The Mac reboots and does it's thing before restarting.

Then it notifies me that the update was unsuccessful, but the update disappears from the App Store (for a while).


I also have Parallels installed, which I can't uninstall, because it's business critical.

Mar 16, 2018 6:48 AM in response to GBoy_SY

I am experiencing the same problem with the install for Mac OS Sierra 10.13.3 update. I attempt to install and it restarts my computer and says install will take about 1 minute and it freezes. I then have to manually shut down the computer and restart. Within a few minutes, the reminder shows up to install the update. It hasn't worked in the 5 times I have tried. I am tired of having the install reminder stuck on my screen blocking my view. I wish that I could find a suggested resolution.

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High Sierra update 10.13.3 won't install

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