the link https://itunes.apple.com/us/app/macos-mojave/id1398502828?ls=1&mt=12 give me the same result it launch ITUNES and only download the 22.5MB file.
i will try later when the server may be less busy.
@MACHOUSTON In case your situation is the same as mine: I didn't get the full installer from the App Store until I updated the Branch of my Software Update Server. I use locally hosted Jamf's NetSUS Software Update Server and hadn't added any new releases today. The App Store still saw the option to download, but just the small version like you did. Once I added today's release to the Branch I'm pointed at it allowed me to download the full installer from the App Store.
I had no luck downloading the full 10.14.1 install app from up-to-date 10.14.1, 10.14.0, 10.13.6, or 10.12.6. I also tried softwareupdate --clear-catalog without luck. Ultimately, I used Greg's handy installinstallmacos.py script to build a 10.14.1 18B75 install app, but System Image Utility would not recognize it as a NetInstall source. I created a 10.14.1 USB installer, did a clean install from USB, then downloaded the full 10.14.1 install app. In other words, I got the stub download on 10.14.1 updated from 10.14.0, but I got the full download from 10.14.1 not updated from 10.14.0. By the way, I initiated the download from the 10.14 App Store app, but it was handed off to the Software Update preference pane.
I only did it once as I was leaving for the weekend and didn't get to see if it was 10.14.1. or 10.14.0. When I downloaded the mojave installer on a machine that had 10.14.1. all ready installed it did download a full installer...