Never, ever, use downloads provided by retailers. They are old and, a DVD "backup" in our case is entirely useless, since the latest version of the installer can always be freely downloaded from our site. And the error in your screenshot shows your DVD backup failed.
Just download and install GSX from the installer on our site. The only thing you need to backup, is your Serial Number, that's the only thing you need to be able to reinstall in the future.