%APPDATA% is a hidden directory by default, and will redirect to
C:\Users\<your_username>\AppData\Roaming\ If you copy and paste
%APPDATA%\J River\Media Center 19\Cover Art\ into the Windows Explorer address bar (or the "run" box by pressing
Win+R on your keyboard) it should take you to the correct location.
I just realized that you may have to create the "Artists" folder in that location yourself.
To make it easier, you could then create a shortcut to that folder on your desktop by dragging it with the right mouse button and selecting "create shortcut here".
I suppose we could offer Genre specific artwork, it wouldnt auto-lookup anything of course, but if you manually feed it..
That would be awesome.
What might be nice - though perhaps more complex than it's worth - would be an option to add artist/genre art via the Cover Art menu above the "Get Artist Images From Last.fm..." option, similar to the way you can manually add album art.
That might get complicated though as tracks may be tagged with multiple genres (e.g.
Soundtrack\Film Soundtrack) though perhaps you could only display the option in a Genre-specific view, where they are displayed hierarchically.