there is no subsilver3 for 3.1 yet.
the author of that style will have to convert it to work with 3.1
it currently works with 3.0 and is not compatible.
if and when the author converts it over you will be able to install and use it.
we have no idea what the changes in 3.2 are going to be so it may or may not work at all.
however, I assume that 3.2 won't be so different that prosilver based styles will not work.
remember subsilver3 is a prosilver based style made to look like subsilver2 but it is not subsilver2 based.
I am available for custom work on a donation basis. Please send me a PM with your needs.
Premium phpBB 3.2 Styles
OK, so what's the speed of dark?