Open the link with your mobile browser.
Tap download and choose Install.
Open the app after installation is complete.
You may see a notification that the developer of the app isn't trusted on your device, tap Cancel.
After dismissing this message, tap Settings > General > Profiles or Profiles & Device Management.
6.点击信任 Tutor Group, Inc
Tap Tutor Group, Inc. and Trust “Tutor Group, Inc.” to establish trust.
Once you have established trust, you will be able to run the app.