The extension doesn't show swatches on category page

As far as you faced such problem while using Color Swatches Pro module, perhaps, there is no 'Add to Cart' button in your Magento theme. As a consequence, there are no swatches on category page.

To solve the problem, open

Admin panel/System/Configuration/Amasty Extensions/Color Swatches Pro/Advanced settings

and perform the actions that are shown on the picture:

Are you looking for the same functionality for your Magento 2? Look at our Color Swatches Pro solution.