After downloading this game twice, once with the downloader and once manually, both came up as corrupt. The downloader didn't finish downloading the game, it came up with a checksum error in one of the last few files and then after manually downloading all the files when I went to install it I was told that something was corrupt, it didn't say what, just told me I should use the downloader.

What the hell is with this broken cheap ass crap? 24 hours wasted downloading...I should be well into this game by now but no, have do spend hours downloading broken crap that's useless.

You waste dtoo mcuh of my time GOG, you are on my "no buy" list from now on.

Quick question, the drive where are you trying to download it is NOT FAT32? Though is very common to use as filesystem, Red Project create files bigger than his limit (4 GB), so if you try to download Witcher 2 to a FAT32 drive it's a lost cause.

The most moder partition will be Ok (NTFS for Windows, ExFat, Ext4 for Linux, HSF+ for Mac)

No, it's not FAT32.

Seeing as there are threads dating back more than 2 years about corrupt downloads of this game I am pretty sure the fault is GOG's and no one else's.

Why do you use the downloader then? You know that you can download without gog installer right? Installer works fine for me but it doesn't work for some very well. Also it depends on you internet connection, 24 seems a bit long imo. I have the same problem (not with gog but rar files) when my wifi disconnects for a second (cause of too much users) and my download get corrupted at 80% or so. It sucks I know but gog download manager doesn't have a back up function like Steam/Origin.

Try to download every part separately and manually so that if one part doesn't finish download at 100%, you don't have to redownload all other parts.

No; the fault is always your network. Except in the rare and transient cases where Edgecast's servers are overloaded, there is a reliable fat pipe all the way to your service provider. It's the last mile to your residence and the in-house fabric to your computer that causes 99.9999 percent of the problems.

This is a huge download, as much as 15GB. If you have a reliable network (I have use of a DS-3 trunk), it never fails. But it doesn't take a long interruption on your end to make it fail every time.

If you have an unreliable network, and many of us do, the alternatives (in decreasing order of goodness) are:

Purpose-built downloader that knows how to resume after a fault, like WinWget.

The GOG downloader

Browser downloaders, since these will break every time on a fault and force you to start over.

Well, let's see.

I downloaded it with the downloader and got the error most of the way through. Seems it stopped somewhere towards the beginning to part 10. Looking at the file list I deleted the incomplete file and let the downloader continue the download, it failed on that particular file several times.

Then I manually downloaded the last files to see if that would work (parts 10-12 I think?) I got a corruption error when I rand the setup program. So then I deleted everything and downloaded all the installation files manually and they all downloaded fine but still, when I went to install it I got the same corruption notification.

So no, it is NOT my network or my computer. I don't have this issue with anything else, at all. Any network interruption on a manual download through my browser would kill the download completely and delete the partial file, not give me just a partial corrupted file. Even if it did, it's pretty easy to tell when the downloaded file size isn't what it should be.

Best contact them then.

I am not saying it is not an issue with the network, but I have been having similar problems. After attempting to install I have found one file is failing the integrity check, I have re-downloaded "setup_the_witcher2_ee_3.4.0.25-3.bin" at least 3 times since the first and each time it fails integrity check.

I will be contacting support about this, hopefully they can sort it.

Support has been in touch about the downloader and will be examining the files on its CDC later, however, still when I try to download part 11, it says 1.5gb on the page, but when I d/l it it is only 608 mb! and then the installer says its can't find it, I don't think I am doing anything wrong.

I've spent the last 12 days downloading Witcher 2, and it seems to me GOG updated the game on the 30th or 31st of January. All files I downloaded before that date were in working order, everything after that date was corrupted, according to the installer. When I downloaded and ran the installer files (the two small ones) again, the bin files from before January 30 were indicated to be corrupted, while those from February were alright. Also, bin file 11 (the 600 MB one) went up a bit in size, though its indicated size in the download list has not been changed.

Seems to me at least some of the problems with corrupt downloads could be avoided if GOG clearly indicated when a game has been updated, especially with games cut up in a dozen chunks.

Though maybe some people have confused the number of the installer file as indicated on the download page with the number of the bin file itself, which is one less.

It's definitely not at GOG's end. I said it before, and I stand behind it: GOG has the correct files provisioned on adequate servers. If you are not getting clean downloads, you will not get any satisfaction by complaining to them or claiming their downloader is broken or their files are incorrect. The only way to solve the problem will be by determining whether the download is not getting through your ISP, not getting through your local network, or not being handled on your computer.

I just ran the Witcher 2 download yesterday to make sure. It all came down, passed integrity check, successfully installed, as it has every other time I have checked this. It's not their problem.

Let's get some more information and less speculation, hmm?

I have been having this same corruption issue for as long as anyone, but finally managed to have some success by using a different downloader client (wget, in my case, but you can probably use any client with resume capability). In other words, don't download through the browser or the GoG Downloader. Use a separate piece of software (I'll leave it up to a Microsoft user to find a good one).

For those who have been blaming the users:
Over the course of the last ~2 years, I have had 3 different computers, lived in 3 different locations, used 3 different ISPs, and ran 2 different OSes. There were overlaps in all cases. I've used the Downloader, I've done browser downloads (with 2 different browsers). As with other users, when I started using GoG, downloads worked fine. Sometime in the past 2 years, though, something changed and I started having issues with downloads.
Perhaps, instead of blindly laying the blame on the users, it would behoove you to ASK them their situation. The more data we collect, the faster we can nail down WHY this is happening, instead of just WHOM it is happening to.

Computers: 1 Eee Touchscreen running Arch Linux; 2 custom-built desktop PCs running both Windows 7 and Arch Linux/Slackware
Locations: Upper Peninsula of Michigan; northern suburbs of Minnesota's Twin Cities
ISPs: Comcast cable; CenturyLink DSL; and I can't remember what I was using in Michigan
Browsers: Firefox; Chrome; Chromium (Arch Linux's rebranding of Chrome)

Again, wget works for me. Hopefully, someone with Windows installed can try another downloader program and report their results. (Note: checking the file sizes is an easy way to detect one type of failed download)

~Fears