If it *is* so very heavily supported as to have a GUI installer, woah, some documentation/references need updating
that may well be the case. I think mt-daapd/firefly information is quite spread about…
A quick google search under ‘firefly media server’ brings up the homepage and following the download link and choosing the ‘stable’ link does indeed end up on the sourceforge page. I see where you’re coming from… 🙄 Mind you, if you’d hit on the ‘nightly releases’ link, then you would have found further links to stable/unstable SVNs with download options for flavours of firefly from your regular Mac/Windows/Linux to debian/unslung/ubunutu etc.
http://nightlies.fireflymediaserver.org/
cheers, Andy