(This article was originally published on Dec. 21, 2018.)
For users of the application DEMO
Please download the application from below.
You need to trust the application as it is distributed. For more information, please see the FAQ.
FAQ
I installed the app on my iPhone/iPad device, and when I tried to launch it, I got an alert with the title. The message is as follows "iPhone Distribution: [Developer]" is not trusted on this iPhone. Until this developer is trusted, you cannot use their Enterprise App.
solution
Trust the developer's app from Settings > General > Device Management. For more details, please refer to How to download the app for iPhone at the bottom.