how to update MacBook Pro (Retina, 13-inch, Late 2012)
I am unable to update this. I have had someone to update, and keep current. This is the model etc....
MacBook Pro (Retina, 13-inch, Late 2012)
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Your model build year MacBook Pro could run Catalina 10.15.7.
Some users with older software may require 32-bit support for
apps and drivers; still offered by Mojave 10.14.6.
• How to get old versions of macOS - Apple Support
https://support.apple.com/en-us/HT211683
Should you also find need to try & install macOS w/ Bootable Installer..
Carefully read the options and methods spelled out in article below:
• How to create a bootable installer for macOS - Apple Support
https://support.apple.com/en-us/HT201372