How could I modify the WisLink LX200V30 EVB to work on higher voltage powerlines?

My apologies if I’ve categorised this incorrectly.

I’ve been looking at the WisLink LX200V30 EVB. It’s noted on its product page that is usable on powerlines carrying up to 400V DC, but we’d like to use it on a higher voltatge powerline (something like 600V DC, perhaps higher).

Are there any recommendations on how the design of the interface on the EVB could be altered to allow the LX200V30 to be used like this? Would it be as simple as switching out some caps, or would more complicated changes be needed?

Thanks for any advice