Originally Posted by Kostaz
Adding part 0 and part 1 and overwriting part 2 did the job for me. I got the files from here.

+1

If you're having corrupted file issues, go to the following link:

http://en.thewitcher.com/ee_manual

Re-download the file "Part 2". That fixed the problem for me and seems to have been the issue for a lot of others based on what I've read. It's a small file (took me 3-4 mins to load), so much quicker than re-downloading the entire patch.