I've tried redownloading the game, I've tried redownloading the 3 files from the witcher manual site and it's still not working.


I've just spent good lord knows how long downloading 25gig of nonfunctioning data and I'm at my wits end, does anyone have an idea on how to fix this?

Felt I should mention this is as well, after downloading the patch the launcher crashes on launch.

I would just like to chime in and say that I have the same issue. Here is what I've done so far:

Downloaded the game using the GOG Downloader.
Installed the game without any issues.
When the launcher asked if I wanted to download Enhanced Edition, I did.
Once the patch was downloaded, I realised that I didn't have space to also install it on the same drive, so I moved it to another drive. However, during installation, I got a "pack0.dzip" error, telling me the source file was corrupted. A quick Google said I should download and replace three files in the patch download folder, so I tried that but got the same error message.
Hoping to avoid downloading 12.25gb again, I reinstalled The Witcher 2 from the installation files, but I got the same error. So I reinstalled Witcher 2 again (since it won't even start the launcher after failed patching) and set the EE Patch to download overnight, this time downloading directly to the drive I wanted to install from.
However, this morning I got the exact same message as before, on a fresh install of Witcher 2.

I am currently re-downloading The Witcher 2 from the GOG website, but I honestly don't have high hopes. The installer checks for file-integrity before installation, and made no complaints the last 3 times I installed the Witcher 2 .

Please provide a solution. I would dearly like to play this game.

Update: As it turns out, the GOG Downloader has also stopped working. It now silently closes on start-up with no error messages. This problem persists on restart.