sticky keys without lock in macOS Sierra
karabiner developer announced on karabiner website that macOS Sierra is not yet supported


  macOS Sierra support status
  
  Karabiner does not work on macOS Sierra at the moment.
  
  We are developing Karabiner-Elements which provides simple key
  modification for macOS Sierra at first. (Karabiner-Elements works well
  on macOS Sierra. We are working on fixing several remaining issues.)
  
  We'll start updating for the full featured Karabiner for Sierra after
  Karabiner-Elements is completed.
  
  https://github.com/tekezo/Karabiner-Elements


You can download the latest Karabiner-Elements from https://pqrs.org/latest/karabiner-elements-latest.dmg