Plugin not working

I installed the plugin and i was using it without problems but after the update no longer works as before. What amount should have at least 6 will now not work and puts 1 in all products, and everything is set as it should be, because before worked fine!
The site is https://cepadevinos.com/
I need help please!

https://www.ads-software.com/plugins/woocommerce-incremental-product-quantities/