Sufyan: Large files downloaded through a web browser can become corrupted, especially when using a bad internet connection. Since this has obviously happened to you, I strongly recommend you use the GOG downloader instead. Install the GOG downloader and restart your web browser. Log in to GOG.com again and go to your library and open up Wasteland 2. To the right you will find an on/off toggle for "GOG downloader mode".

With this turned on, the GOG downloader will start when you click the link to download the game.

The main reason you should use the GOG downloader is that it can check the downloaded files for you. If they are corrupt, the downloader will attempt to fix the files by downloading the missing parts. You may have to restart the downloader a couple of times before it will get it right and fix the corruptions, but in the end it is guaranteed to work.

Another benefit to using the downloader is that you can pause the download and continue at a later time. This is important for people with unstable internet connections or limited total bandwidth use.

Soulkain01: That would be great except the GOG downloader gives me this message: the application failed to start because its side by side configuration was not correct.

Gydion: It's best to post that error & your OS info in the GOG.com Downloader thread. Side by Side error means you are missing one of the redistributables, but I'm not familiar with which ones it uses.