I use Vim, but my question is which of the 43 fonts do I want to use?
In any case, usually when there are various ttf files for a single font, they all belong to a Font and then have variations (Medium, Medium Italic, Condensed, etc) Depending on the software, it maybe presented with 43 different fonts, or one single font, with variations (On mac, if you open Font Book, you get the font name, then you can expand to the variation, don't remember how it works on Windows)
set guifont=Source\ Code\ Pro\ for\ Powerline\ Medium\ 11