Like everyone else, most did not get the Ground Plane to works. It would be nice if anyone here got it working could upload the APK files and the project files.
As of now, I'm still skeptical that its even working, so thats could be the reason it takes so long for Vuforia to upload a sample project, which could only takes 5 minutes to do. Hope I'm wrong tho.
@detomato Which download link sent you to the Unity Download page? The link for the latest Vuforia for Unity SDK will do this as it is integrated with Unity 2017.3
Thanks,
Vuforia Support