I recently bought my first gog game, fallout 1. Upon download, the .exe starts to check its own integrity. This always fails, aborting the installation process with a message telling me to download the setup file again. But no matter how often I redownload the file, the same thing happens. Does anyone have any idea what I am doing wrong?

Also, if you haven't done this lately: Update your anti-virus and anti-spyware apps, then do a full system scan. A tiny bit of low-risk malware might have snuck onto your system, and it *can* cause problems like this.

I'll second this.
The downloader works quite well, and alleviates many problems with browser dl'ing.

Thank you all for your advice! After several attempts, pausing the downloader a few ties actually worked. I have no idea why, but the problem is solved, and I'm happily playing Fallout. :)

cool beans dude. Like I said, it worked for me too. :)