Due to iOS system permission adjustments, to open the app, please go to "Settings >> General >> VPN & Device Management" (called "Profiles" on iOS 9 and below, and "Device Management" on iOS 10 and above), and trust the profile or enterprise app certificate with the same name.
Detailed illustrated tutorial:
1
If you open the downloaded "app" and see the following prompt,
Remember the name of the profile in the red box
2
Then tap on your iPhone
【Settings >> General >> VPN & Device Management】
(On iOS 9 it's called "Profiles," on iOS 10 it's called "Device Management"), find the profile with the same name as before.
3
Tap the profile,
Select "Trust"
，and then you will be able to open the app normally.
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