Monterey 12.5.1 not showing up after attempt to install

There are factors:

1 - Like poor Wifi connection

2 - Slow wifi connection

3 - Too many other people downloading at the same time and Apple Severs are overloaded

4 - Software on the computer interfering with the download process including AntiVirus Software

Notation: Disabling the AV Software may or may not solve the issue. Removal of the AV Software may increase the chances of the download to perform as expected.

5 - Running behind a VPN which may increase Packet losses or corruption of the download 

6 - If via wifi too many Other devices using the wifi at the same time reducing the Bandwidth to your computer. 

7 - Best Results are via Ethernet Cable to Router

8 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal and Try Again using the Software Update Applet in System Preferences

9 - Worst case - Restart in Recovery Mode and choose Reinstall macOS. This in theory will pull latest version of Monterey available and commence the installation.

Part 1 or 2

There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX  Foundation and Permission Limitation. 

Additionally, and specific to Big Sur macOS 11 and Monterey macOS 12, the Operating System resides in a Sealed and Read Only Volume that can not be opened by the User and protects against from “ Bad Actor “ Software.

The Only thing this Antivirus software is protecting is the Bank Account of the Developers and for zero return to the User aside from the problems this software creates.

AntiVirus Developers purposefully Market their product to create a “ Fear Factor “. In so doing, creating a False Need for their Product.

The The Built in Security  is all that is required to protect the computer.

Part 2 of 2

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster and comprising the Operating System

Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. What the Application may do to the computer is up to the User to check this out before purchase

Any of the below should be removed as per Developers Instructions

The below list is only a Partial List

This will include CleanMyMac , This will include BitDefender , 

This will included Norton Antivirus , Sophos Av Software

Intego AntiVirus, McAfee, MacKeeper, Avast AntiVirus

Ad Guard, Webroot , ESET , Kaspersky Antivirus. Anti virus

We found that a security client was blocking traffic to gg.apple.com during preparation.

I recommend running the terminal commands to assist in troubleshooting the download and installation. When you run the installation via terminal, we found that during preparation, the installer requires access to the internet to get firmware information on your mac.

Ensure your macs have access to these enterprise urls: Use Apple products on enterprise networks - Apple Support

We found that during preparation, the installer requires access to the internet to get firmware information.

Try these terminal commands:

Download Full installer via Terminal: (12.5GB)

sudo softwareupdate --fetch-full-installer --full-installer-version 12.5.1 

Install macOS Monterey via Terminal: (After you confirm the installer has been downloaded)

/Applications/Install\ macOS\ Monterey.app/Contents/Resources/startosinstall --agreetolicense --forcequitapps --nointeraction --passprompt

The last two updates (including 12.5.1) refuse to complete on my M1 Mac Mini, each time presenting a "Failed to personalize the software update. Please try again" error notification. The small print recommends that I "Please check [my] internet connection and try again," but with no benefit for me when I do so. This represents two security updates that I don't have access to, and I worry about the upcoming OS 16. Is there something else I should be doing? I've never had this problem before.

Hey, Tom.

Thanks for the post, if for nothing else “misery loves company”! I have tried every single remedy that you have, and our results are identical, save for the fail-notices we receive.

I guess we will have to keep on trying, and crossing our fingers that OS Ventura will work the first time we try to download. Good luck!

Sam

Thank you so much Tom. I’m glad that you got a little hope installed, and here’s hoping that your next attempt will finally fix it once and for all — until Ventura, of course! I appreciate your time and experiential knowledge. Have a good one.

I had three failed attempts. I detached a USB hub and it was successful on my fourth try.