Peetz: Better update to 1.2, because you can now buy everything you need.
coastie65: The retail disk version won't update. I have been playing it without the 1.1 or 1.2 patches and it does fine, I got all the DLC stuff. Al you get with the retail version is the Invalid or Incomplete message. They have really got things screwed up this time. As I said, it's playable without the patches and seems to be fine. The next play through I'll whack the Troll and get his tongue and do the ritual. I guess i could also purchase a digital download of the game which would patch, but being retired I need to watch the money.
Coastie -
There's been a lot of fixes from the retail release, so you really should update. The post above gives a link to issues that you may have (especially since you say you have installed all the DLC stuff).
Go here to get the International version of the 1.1 Patch -
http://en.thewitcher.com/patch/
Open up your game folder, and in the CookedPC folder move out the Troll.dzip file to somewhere else, then see if your installation won't update to 1.1
If that doesn't work, move out all the DLC .dzip files from that folder somewhere else and try again. If you have mods in place, move them out if this doesn't work.
If you succeed in updating to 1.1, then it should try to automatically update to 1.2
Let us know how you get on.