I am also having Connection Closed error messages.
I figured out where the files were being downloaded from and just am downloading them manually 1 by 1 as it calls them out.
Running
openSuSE 12.3 X64
Phenom II 1045T
tmpfs+dmraid /mnt/rpdrive/wineswg/drive_c/swgEmu/SWGEmuLaunchpad.exe
wine64 1.5.23
No winetricks windows files added yet.
The internet connection is, not the issue.
If the developer wishes to contact me on IRC. There is a good chance i can obtain any debug data needed to resolve the issue.