Hi All,
Sorry for the confusion. There are two things happening simultaneously: the game is getting converted to our new download system, and it is also getting patched.
The new download system will help ensure that patches for games like The Witcher 2 are as small as possible in the future.
Unfortunately, the conversion process currently has the same issue as the old download system (large files that change are re-downloaded completely), so this update is not getting applied as efficiently for people who already had the game installed. We had hoped to iron out this issue before switching the game to the new system, however things didn't work out that way. The self-patching system previously used by the game was not available for this update, so we decided that if users must suffer through another large update, we would also get it converted over to the new download system so that that this would be the last time.
Taylor