shirakani: Tested, all working. DO NOT USE THE LAUNCHER. Hell, don't even bother with the Launcher anymore for anything at all. Run the witcher2.exe manually in the bin folder to run the game, easier. The launcher is a waste of time.
All this really does is put the corresponding .dlc files in the CookedPC folder. If you previously had the decrypted .dzip versions from TEH INTERNETS, then you can leave those there and they will work too.
Otherwise, just make sure the corresponding .dlc files are in the CookedPC folder and just run the game, it will all work.
Where do you get decryped .dzips? The ones listed in this forum show up in green text in Windows Explorer which mean they are encrypted. How do you decrypt them ?