Clare Solo is a Kontakt instrument, not a Library. To access it, use the Files tab and navigate to where you've installed the Clare Solo files. Once there, double click on, or drag the .NKI file (Ivy Audio - Clare Solo v2.nki) into the instruments window in Kontakt.
I have a directory under My Documents called "Kontakt Instruments". That's where I install all instruments that are NOT libraries (that is, they haven't paid NI a fee). All (or almost all) free or inexpensive Kontakt instruments are delivered this way. Here's what's currently in my K.I. folder.