I just tried Free Download Manager (FDM), again, having the Firefox addon Flashgot use it. The download gets passed to FDM, and fails, giving the error message "access denied, invalid username or password." No password was required. The site I'm trying to get the file from is turbobit.net, which limits downloads speeds to 100kb/sec, and has a 59 second countdown before you get the link. I guess it's transparently using a password on their end. If I just download normally (save to disk) the download starts fine, but it fails after 30 minutes to 1 hour (always different), and my Wi-fi connection will stop briefly - and I have to start all over. So I will never be able to download a large file. I also tried DTA instead of FMD with Flashgot, and I get an "access denied" message in DTA. Again, I reloaded - waited the 59 seconds, and download w/Firefox, and the download starts fine. The failure message in the Firefox Downloads window is "source file at http... could not be read."
Any help would be greatly appreciated. When is Firefox going to finally add the ability to resume downloads????? Is there some other software I haven't found using Google that will work?
This page says: "This error can occur if the connection to the server was interrupted during the download. Make sure you are connected to the internet, then try the download again." - regarding the error message "... the source file could not be read." http://kb.mozillazine.org/Source_file_could_not_be_read
BTW - I have watched this closely, and the download quits when the wi-fi connection fails for a moment. The download fails after a different time period each time I try it, and after a different number of MB's have transferred - so it's unrelated to the server at turbobit.net.