Downloads
The current version of wsnow is 0.92.
Everything you need to run wsnow is available in a zip file.
Download from this site
Current version: wsnow-0.92.zip
Download from sourceforge
Run wsnow
Download the zip file, unzip it, enter the resulting folder wsnow-0.92 and open the file "index.html".
Sure, you can place wsnow on you website. If you have one, I guess further instructions are not necessary here.
Run now
You can also run wsnow at this very moment