TheJoe: Don't panic too much. pack0.dzip is corrupted for
some people, why? Who the hell knows?
Anyway, I've done some digging and pack0.dzip appears to be in TW2EE_Patch-1.bin, what does that mean?
You do not have to redownload the whole game! Do
not let the installer continue after pack0.dzip, click ABORT to roll back the changes, now delete TW2EE_Patch-1.bin, run the launcher and redownload the patch. Keep doing it until dzip works. If you do not abort at the dzip stage you will have to reinstall The Witcher 2
entirely.
If you're on a slow connection, you're gonna have to wait for an official solution.
thanks i'll try that.