I've seen many people who mix this and that, but i'm pretty sure you can not download this one, i think it's made specifically for this site. Either by the owner of the site or from someone "outside" (for money).
It would be too complicated to explain how you mix templates, i'll leave that to google or the search function of this forum. Basically, the easiest thing for you would probably be to just modify subSilver and then modify it to something you like. I would not recommend mixing subSilver and Conundrum like on this golf site, as the source code of these two templates are very different.
There's no easy shortcuts i'm affraid. Except maybe try to email the site owner and ask him for a copy.