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Big Sur Update 11.6.5 Fails to Install

I have been trying to install the latest Big Sur update for a few months and each time the install fails and tells me to try again later. I have searched for potential causes and have found nothing. I am fairly new to iMac (<3 years) and this is the first problem I have encountered.


iMac 21.5" (Mac19,2)

3GHz 6-core Intel Core i5

6GB 2667 MHz DDR4

Radeon Pro 560X 3 GB

1.03 TB Fusion Drive (25.04 GB free)

macOS Big Sur 11.6


iMac 21.5″, macOS 11.6

Posted on May 9, 2022 3:54 PM

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Question marked as Top-ranking reply

Posted on May 9, 2022 4:06 PM

The latest update/upgrade for a 2019 iMac is 12.3.1 Monterey.

see > How to upgrade to macOS Monterey - Apple Support

3 replies

Big Sur Update 11.6.5 Fails to Install

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