Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Monterey Installer app fails preparing installation

When upgrading from Big Sur 11.6 to Monterey, the software update launches an installer app which goes through the preparing progress bar prior to restart. At the point where it says “closing applications and preparing to restart…” there’s a popup saying “An error occurred while preparing the installation. Try running the application again.”

Running the installer again fails at this step. Rebooting, resetting SMC, erasing and re-downloading the installer all do not fix the problem. The date and time are accurate. Disk Utility first aid doesn’t make any changes and skips over repairs. Has anyone managed to find a solution to this problem?

MacBook Pro 15″, macOS 11.6

Posted on Oct 25, 2021 8:32 PM

Best reply

joshuapinter

Level 1

14 points

Posted on Oct 27, 2021 7:08 PM

Use the original SSD.

I confirm the following worked great for me on my 2015 MacBook Pro 15".

Installed original SSD.
Installed fresh copy of Monterey via the USB stick onto the original SSD (it rebooted a bunch of times, indicating a firmware update).
Put the new SSD back in.
Booted off USB stick and upgraded to Monterey without a hitch.

It sucks if you don't have your original SSD but maybe you can get a cheap one off of the interwebs. Doesn't have to be big. Likely doesn't even have to be the same one that came with your unit. Most likely just *any* genuine Apple SSD.

Good luck.

View in context

Monterey Installer app fails preparing installation

Similar questions