It's not working. Every time, I try to download, it always comes up as Microsoft file.
On the official website, there is a link on the bottom of the page that gives you the download link to the Mac version of the software. I recommend downloading the application through the link posted below if you don't find it on the official website.
Official website: http://www.nch.com.au/wavepad/
Direct download URL: http://www.nch.com.au/components/wavepadmaci.zip