The Mojave link in this article does not work. Via Safari it takes you to the App Store. When you start to download, the App Store tells you that the installer is damaged and cannot be used.
The link to the App Store to upgrade from High Sierra to Mojave does not work on my wife's MacBook Pro. When you start download, it stops, and indicates that the Mojave installer is damaged and will not work.
MacBook Pro 13″, OS X 10.11