I notice in the downloads from about 2009 backward, all of the old comments are feedback posts even ones that say "Thanks this is great" or something. It would make sense if a few people just forgot and hit feedback button by mistake, but there are so many of them and only recent thanks type comments show as thanks. I was wondering why this is.

We only added the Thanks type comment in 2009ish, so prior to that, all comments were normal - aka feedback - comments.