How Do I Get Calibre to "See" Libra 2?

I bought a Kobo Libra 2 but I'm having problems sending any books to it which aren't from the Kobo website. I'm transfering via usb. For some reason Calibre doesn't see the ereader. I have no problems with my kindles and Calibre.

I have version 3.48. According to the website, this is the latest recommended version for Windows 7.

Is there anything I can do about this? As it stands now, there's no way for me to get any books onto the Libra, not even MR's beautifully formatted pd books.