I don't see a pro version for sale on their website
and to get that look in the image you sent its a plugin
https://www.themehouse.com/xenforo/2/addons/nodes
This theme doesn't really appear on their page or a page as a complement
It seems only that you have already purchased or have some other type of relationship there, you can access this theme or add-on
I say it this way because it seems like a time and also a complement at the same time
But basically it adds the yellow highlights below
This function marked below I know is another add-on
I know UI.X Dark Pro doesn't do that
Wasn't that the highlight
But yes
They don't have a page highlighting this on their website
So it's a little difficult to get more information