It would be best to provide all the details mentioned in the blue post which is sticked here at the top :)
The log file will tell me more.
My bad, I read the OP too. Just completely ignored it. :P
Can't attach via post, and support has the same image-only limitation, so here's a Pastebin of the log. http://pastebin.com/d48nRmQg
Downloader version: 188.8.131.52 (stable)
OS version: Vista Home Premium
OS language: English main with Russian enabled (Causes a surprising amount of problems, didn't switch between languages while I was starting/running the Downloader though so it shouldn't have done so here)
Description of problem: Added several downloads to the list before opening Downloader, the Downloader opened, added a download, froze, crashed, then opened again. Downloaded everything except for a "ghost" activation, a download which was added to the list but never started or collected the information. So for instance, if the download was Ground Control, the download for the bonus content never got to the point where it had a download for the manual and another for the avatars, just asking for details.
That ghost download then stayed in the Downloader and kept crashing, giving a "X.Too.Large" error, forget what X is. As soon as I hit "OK" on the error box the program crashed. Fortunately the Downloader stayed open and running while this error was up so I was able to remove the ghost download from the list and then restart the Downloader and it's worked fine since then.