Can't upgrade MacOS

[xlrtech]

0
I have an imac 2017 21.5in running High Sierra, and can't install Ventura, I receive a message saying installation is damaged and can't be installed.

 

[Realityck]

0
I have an imac 2017 21.5in running High Sierra, and can't install Ventura, I receive a message saying installation is damaged and can't be installed.

Install it from full installer on App Store, or from recover mode via network. Also backup your SSD. so might have to check what format. your internal bootable SSD is.

 

[Bigwaff]

0
I have an imac 2017 21.5in running High Sierra, and can't install Ventura, I receive a message saying installation is damaged and can't be installed.

You may first have to update to Mojave 10.14 or Crapalina 10.15 for firmware and APFS updates before attempting Ventura install.

 

[bogdanw]

"macOS Ventura Full Installer Database. Download Directly from Apple!"
https://mrmacintosh.com/macos-ventura-13-full-installer-database-download-directly-from-apple/
Ventura 13.7.4
https://swcdn.apple.com/content/dow...t0eyfr278z60061tw15x7g40/InstallAssistant.pkg

 

[xlrtech]

You may first have to update to Mojave 10.14 or Crapalina 10.15 for firmware and APFS updates before attempting Ventura install.

You nailed it! No other information resource - including Apple Support - suggested this, but it did the trick. Thank you for your help!