I'm having a similar issue. Just installed the latest update. The application is no where to be found but three processes are still running that I can't get rid of.
machine:~ user$ ps aux | grep karabiner
user 259 0.1 0.0 2471072 2920 ?? S 4:58PM 0:00.05 /Library/Application Support/org.pqrs/Karabiner-Elements/bin/karabiner_event_dispatcher
user 466 0.0 0.0 2471132 3504 ?? S 4:59PM 0:00.09 /Library/Application Support/org.pqrs/Karabiner-Elements/bin/karabiner_console_user_server
user 756 0.0 0.0 2432804 748 s000 S+ 5:02PM 0:00.00 grep karabiner
root 55 0.0 0.0 2473596 4980 ?? Ss 4:58PM 0:00.23 /Library/Application Support/org.pqrs/Karabiner-Elements/bin/karabiner_grabber
When I try to kill them with kill -9, they simply respawn.
How do I get rid of these?