Quick Answer: Liquid Notes is installed as a separate application outside of the DAW. Find it in your application folder / launchpad (Mac) or program directory / start menu (Win).
Launching Liquid Notes after installationLiquid Notes is not available as a VST, AU or AAX plugin. Hence, the installation routine of Liquid Notes installs the application into your machine's regular application directory - consequently, the application is not to be found within a DAW's plugin directory or similar. Instead, it is located in your application folder / launchpad on Mac or program directory / start menu on Windows.
To start Liquid Notes, go to the launchpad or start menu of your machine and select Liquid Notes or Liquid Notes for Live from there.