fyi: 1.2.0 is released
You place the dll or the folder with the dll in the folder defined in your Settings as VST-plugin-foldervst folder to put it in
Default it is: C:\Program Files\VstPlugins\
To use it, you drag a VST-instrument
in song-editor, and browse to the VST you like to use, by clicking on the bright-green folder-symbol on the UI of this VST-instrument container