I downloaded SpeedDownload the other day, installed it, decided almost immediately that it wasn't for me, uninstalled it (I thought) & boy, I thought I was never going to get rid of it.
I'm running 10.2.4 & Speed Download put files in at least a half dozen places. I went thru the User's library 4 times until I got it all rooted out. It was in Safari, Explorer, Contextual Menu folder. prefs, you name it.
BTW, Sherlock kept reporting no files left but when I'd try to use the download manager with either Safari or IE a message would come up "sending this URL to Speed Download" & then Safari would crash. ...so back I'd go to the library again & start looking. I ended up opening every single folder in User's/Library.
Finally got it done. Never again. iGetter & Speed Download is not for me.