hello everyone, i started the launcher, and i was asked if i wanna update to version 1.2, so i clicked "yes" and the update was downloaded and installed, only that after the update finished i got an error "installed game version is invalid or incomplete", and i cant play the game at all...

any one has any idea waht went wrong?

The search button is your friend....................

That message usually means that is DIDN'T install. It only downloaded.

Check the version on your game executable, but pretty sure it didn't take. You likely have a blue icon at the bas of your launcher still...?

Anyway, try going to Document/Witcher 2/Downloads and run Patch_1.2.exe as admin.

If that doesn't get it, start, searching the forum. Somebody beat this problem before.

You might need to download patch 1.1 which you can find right here on GoG if you go to your account and click on Witcher 2 in the library. Then update to 1.2

Don't open the launcher for starters.

Remove any DLC or mods before patching to 1.1 or 1.2.

http://www.gog.com/en/forum/the_witcher_2/cant_install_patch_1_2

This should be helpful.

The near-fail-safe method is:
1. Get patches 1.1 ( ) and 1.2 ( [url=http://en.thewitcher.com/patch1-2/]here). Make sure you download the right version of 1.1 for your game version (retail, gog, regional restrictions...)
2. Un-install game, delete all remaining folders and files except your savegames (this includes the Documents\Witcher 2\Downloads folder!)
3. Reboot, disconnect internet
4. Install the game by starting the setup.exe with 'run as admin'. Do NOT start the game afterwards.
5. Install Patch 1.1 using 'run as admin'
6. Install Patch 1.2 using 'run as admin'

There might be a quicker or easier solution, but if you don't want to mess around long trying to find out what exactly the problem is, this should work.

For most people it is because there are mods in the CookedPC folder that the installer doesn't expect. Clear any mods out and you should be all set.