Mac os 12.3.1 fails to install
I am trying to update from Big Sur to Monterey 12.3.1.
I have verified my hardware is supported. I have 1.5 TB of free dick. I have tried download from System Preferences and from App Store. I keep getting the following error "Installation failed. An error occurred while installing the update." I have restarted my Mac multiple times. See attached. I have contacted Apple Support and worked with them for 45 minutes. No resolution.
iMac 27″, macOS 11.6