I have been trying unssuccessfully so far to install the package for Weka (Weka 0.1.3)found [here](https://pypi.python.org/pypi/weka) on my Windows computer. My problem is that each time I try to run the setup or use the command:

```
pip install -U https://github.com/chrisspen/weka/tarball/master

```

I get an assertion error saying that 

> 
> "Weka JAR file /usr/share/java/weka.jar not found. Ensure the file is
>  installed or update your environment's WEKA\_JAR\_PATH to only include
>  valid locations."
> 
> 
> 

Indeed I do not have this file, but how should I get it? I am not sure if I missed anything regarding the installation, at least I did what's specified on the official webpage. 

Any suggestions? Many thanks!