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grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
Fixed with the help of GOG support , thanx !!!
I had that issue too with Episode 1, downloaded that damn part 3 about 5-6 times, still corrupt.
Then i tried the GOG installer and it worked in the first go. I assume they uploaded 2 different files?
Because the GOG DL also dl's a bunch of the same files :S