This theme needs you to use QtCurve window decoration as well, as far as I know KDE5 doesnt let you do this at the moment. So right now this theme is for people still on KDE4 :-p
Included in the zip-archive is the QtCurve theme and the KDE Color Scheme.
This theme uses graphics for painting windows, so you cant mix this with dark colors. For this reason I am going to upload a dark version also.