I have the same problem: I downloaded the latest version 1.0.3.1. It came as a "gz"-file, I unpacked it locally and now I have several folders and files.
Unfortunatly, the documentation "How to install" on this site here obviously shows an older version with the installation of a normal zip - File. I didnt find any tutorial what to do with my locally unpacked folders and files. (see above).
I would be very happy if anyone would be so kind as to explain this installation process....
Thank you in advance
Tom