I just put up copies of all the old versions of BitTornado on the server, for anyone who's interested in a particular version or who wishes to delve into the code. The archive is at:
I haven't included versions prior to S-5. For those who are curious as to why I seemingly started with version 5, it's because there were prior versions which I only gave out by request. I'd started with Eike Frost's enhanced version of BitTorrent
and went up a version number with each enhancement. The first enhancement was the status light; the second, the Prefs menu; the third, multitracker support, and the fourth was an update of the core code to match it to the latest mainline BitTorrent codebase.
I'm afraid there is no decent changelog to detail differences between versions, and constructing one would be a huge pain, so I'm afraid you'll have to do without it.
(I'm sure some people will comment on the lack of "0.3.9 special"; the fact is, I lost my copy of it and I'd rather not find it elsewhere and then discover it was contaminated with malware.)