Unable to upgrade recent 1Password through App Store in macOS Big Sur 11.2.3 (20D91) For the very first time I cannot upgrade the app through App Store. It fully downloads the upgrade, but when it comes to installation it fails because it cannot quit itself I assume.

I can force quit all 1Password-related processes except of the Extension Helper. When I try to do this via ps aux and kill -s TERM PID, it immediately spawns itself with another PID.
Any help? I'm on Big Sur 11.2.3 (20D91).
The official support gave me the answer.

Quit all browsers
Open main 1Password window
Press ⌃ + ⌥ + ⌘ + Q to quit and indeed it quits all processes.

Weird that the CLI approach didn't work.
Anyway - solved.