Download link on flotcharts.org points directly to Github zipball for the stable (currently 0.7) tag, which does not contain the minified files.
For 0.8 we will work around this by including a minified file prior to tagging the final release, then removing it afterwards. We will move to a proper solution at some point before the next release.
Actually, for stable releases we're now just linking to a static zip file, as we've always done.
I came across this issue when I wanted to create a Python package (wrapper?) around flot. I need the minified versions of those files.
So for anyone who needs the minified versions: