downloader stuck

I would try the first step, and move on to the next step if it fails:

1) Configure your firewall: http://us.blizzard.com/support/article/21072

2) Disable your firewall: http://www.bleepingcomputer.com/forums/topic114351.html

3) Uninstall your firewall: http://kb.eset.com/esetkb/index?page=content&id=SOLN146
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