On Mac:
/Users/USERNAME/Library/Roon is where we hold everything
the app is where ever you put it… like /Application/Roon.app
we also create a subdirectory in your music folder /Users/USERNAME/Music/Roon
On Windows:
%localappdata%\Roon holds everything, application and all settings and databases and caches and all.
we also create a Roon subdirectory in your music folder