[Powerhouse]

EDIT - the addon is downloading and repopulating image files into the individual folders but the default naming convention has changed to filename-clearlogo, filename-clearart etc which is different to how I had been naming it in the past eg. logo, clearart etc.  Kodi still recognises the naming convention but I wasn't expecting this change.  It's an easy config change in MediaElch to apply the basefilename as part of the naming convention but this should be called out as media manager tools won't recognise filenames that don't match whatever has been set as the default config.

Not sure when this changed, but apparently (see the default)...
http://kodi.wiki/view/Movie_artwork
 Naming and Saving conventions for your own manually sourced artwork:Saved movies asFile NameSave Location and exampleBluRay & DVD Structure:

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fanart.jpg/png

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f:\MyMovies\Big Buck Bunny (2008)\fanart.jpg/png

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Single movie in directory:fanart.jpg/pngf:\MyMovies\Big Buck Bunny (2008)\fanart.jpg/pngor (default)

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<NameOfVideoFile>-fanart.jpg/png

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f:\MyMovies\Big Buck Bunny (2008)\Big Buck Bunny (2008)-fanart.jpg/png