plugin doesn't work after wp update

Hallo,
after updating to last version of plugin and last version of wp, plugin don’t work anymore.
Now, selecting a product variation, i can see all thumbs toghether (for all variations).

Any advice? I already tried to refresh cache, both in browser and in wp super cache plugin.

http://redele.it/occhiali/sole/vittorio-c/

Thank you,
Marco

https://wordpress.org/plugins/smart-variations-images/