Before installing the application from this download link, you must allow install from “Unknown Sources”.
See instructions below.
Select Install application.
To use the app, first we need to trust the developer.
Open the Settings app and scroll down to General.
Scroll down to Device Management.
Select Elite Technology Group, LLC
Select Trust “Elite Technology Group, LLC”
Select Trust again then open the Esper app.
Success! Make sure to allow all permissions.