Option 1) You should install Pillow on your Mac:
http://www.geeks3d.com/20131108/begi...l-programming/
Unfortunately it is not so easy
Option 2) Download from
https://github.com/quiris11/ExtractCoverThumbs/releases a package:
ExtractCoverThumbs_0.3-mac.zip (it is standalone console app), unpack it and run from Terminal:
Code:
./ExtractCoverThumbnails