Old Mac upgrade to Catalina

Welcome to the Apple Support Communities.

Yes, you can upgrade to macOS Catalina. First, backup all data using Time Machine if you have not done so already. Next, use Safari to get the macOS Catalina App Store download link here: How to get old versions of macOS - Apple Support. Finally, follow the prompts on the "Install macOS Catalina" App.

Cheers,

Jack

Yes… your iMac meets the requirements for Catalina.. which are here:https://support.apple.com/kb/SP803?locale=en_CA.. i’d suggest you log into the App Store with Safari using your appropriate ID, whichever one you use to login to the App Store and download Catalina… safari works the best for downloading stuff from the App store as it automatically opens App store links in the App store

hope this helps you

john b

Although a macOS upgrade should not delete any data, sometimes things happen. That's why it is always a good idea to have a backup. Furthermore, for data backups, I would suggest you purchase an external hard drive, such as a G-Technology G-DRIVE mobile USB-C Portable Hard Drive - Apple, for a backup and start using Time Machine: Back up your Mac with Time Machine - Apple Support.

Cheers,

Jack

Yes. A late 2012 through late-2013 iMac can be upgraded to Catalina 10.15.7. See: How to get old versions of macOS - Apple Support

This link tells you which MacOS is compatible with which Mac

https://www.macworld.co.uk/feature/what-version-macos-compatible-3776008/

You can check App Store for Catalina and upgrade from there.