Hi Paul,
He’s referring to the pagination within the theme, but it’s actually Wordpress pagination and only utilized by the theme and only styled to match with the theme. The reason the pagination is not working is because the pagination URL format is changed, for example,
This is the URL when you clicked the second page https://rimrubber.com/shop-road-tyres/?product-page=2 which doesn’t work, the correct one should be https://rimrubber.com/shop-road-tyres/page/2/. Hence, this is not a theme issue, something is modifying the pagination’s URL to the format of ?product-page=2
. The correct format is always /page/2/
or ?page=2
or simply /2/
, and it’s Wordpress’ standard, not by the theme.
As for selector, you can give them this .woocommerce .x-pagination a
, though, that’s all we can provide as we’re not familiar how their plugin works, but I can guarantee you that our theme only follows Wordpress standard 
Thanks!