You can install this mod on any style you want. Basically with any modification you have 2 sections. The first is the parts that make the mod function. The second part is what makes the mod visible on your site, these are your "template" edits.
"Elegant Black" is a Prosilver theme. So what you want to do, is where it says to copy the files into "prosilver", you copy and move them into your theme. Then, all of the edits for Prosilver, you just do to your theme. With any theme, you will most likely have to do some small edits to move the part of the mod you are viewing into it's proper place on the page, but that is the fun part. My advice is to copy the Prosilver files to your theme like I mentioned, and do the edits line for line. Then, once you finish installation and refresh your templates, that is where you can edit the code and put everything where it fits according to your theme.
I use this on TwilightBB, which is a subsilver, and it works great. Just took a little bit to get everything to look right. But the mod will work fine on any theme.