TheDingo742: I have gone crazy trying to fix this. I have used the downloader and browser. I have used two different computers. The files are corrupted every time. That is why I was starting to suspect an issue on the GOG end.
I can't say for sure if the files are ok, since i've downloaded them quite some time ago.
But if there was something wrong with the files on gog's server, i would suspect more people would be having the same issue and posting about it here on the boards.
If you're still experiencing the same problem, try to make sure your Av/Firewall isn't interfering with the download/install process.
You could also try a download manager like getright...