Monterey
why can't I install MacOS Monterey on my MacBook Pro 2013
MacBook Pro 15″, macOS 11.6
why can't I install MacOS Monterey on my MacBook Pro 2013
MacBook Pro 15″, macOS 11.6
Because it's too old.
First check to see if you’re on the compatibility list.
https://www.macworld.com/article/673697/what-version-of-macos-can-my-mac-run.html
Monterey