Disabling peer-to-peer worked for me too, but I was not satisfied with having to race against a crash to uncheck the peer-to-peer option. The downloader stores its settings in the wine registry, and they can be changed before launching it. Steps to disable peer-to-peer via wine registry: 1) wine regedit 2) Navigate to HKEY_CURRENT_USER\Software\Blizzard Entertainment\Blizzard Downloader 3) Make a value named "Disable Peer-to-Peer" (without quotes) if such a value doesn't exist 4) Assign "1" to this value Someone more familiar with the wine registry could write a one-liner to be the copy-paste terminal solution for solving this problem.
