After successfully download the App, please follow the steps to trust the App before using it.
If your iPhone is currently using IOS 10 or later version, please follow the steps below to trust the WE APPS.
1) Tap Settings > General > Profiles
2) Under the heading "Enterprise APP", tap "Wisers Information Ltd"
3) Tap "Trust Wisers Information Ltd"
4) Tap "Trust"
And then you can use the latest WE App.