At times, when attempting to install an iOS build on your device Not from the iTunes store (for example via HockeyApp), Apple does not allow you to install the version on your device, as part of it's security mechanism to block versions that do not originate from iTunes.
Please follow the Scheme below, in order to add Applicaster as a Trusted Developer on your device, and thus enable the installation of Applicaster apps on your device.
i- Open the Setting screen of your device
ii- Select the "General" section
iii- Scroll down to "Profiles & Device Management" and click on it
iv- Select "Applicaster Ltd."
v- In the screen that opens, you will see the Applicaster apps that are pending, and those that are verified ---> Please click on the "Verify Apps" button in order to authorise all apps that are not yet verified.
Good luck :)