Can I download the wave file? The download link I tried to download was a .flac file.
I'm afraid you can only download files in the same format they were uploaded.
There are lots of free programs that can convert say, flac files to wav files. Audacity is the editing program I use and would recommend. Open the flac file in Audacity, then "Export" it as a wav.
(Search for Audacity at Sourceforge for free download)