Product category attirbutes are not changing product images on click

Hi Team,

I have just bought your plugin and set it up but not able to figure out few things.

1) when i click on any color or size attribute, on category/archive page then it do not change the product image but i believe your plugin demo does change the image so how can i do that ?
here is category page link : https://vullsportdev.wpengine.com/product-category/women/sports-bras/ you can check the first product in here as i have setup the correct options for that. or even you can check other products too .

2) when any variation like color or size is “out of stock” . then i want to show a popup form on click of that disabled attribute variation. is that possible ?

Looking forward to your response soon on this .