With the new operating system, Apple changed the way to validate applications and now it’s mandatory to carry out the process described below.
Basically it is a security process in which the user is encouraged to validate the company that developed the application is someone you trust. If validation is not done, and in order to safeguard the integrity of the data from the device, the application is considered untrusted.
When you get this message:
Untrusted Enterprise Developer
“iPhone distributer: Projeccions i PDC Media S.L.” has not been trusted in this iPhone. Until this developer has been trusted, their enterprise apps will not be available for use.”
Click Dismiss and take the next steps in order to allow the application to run on your device:
Settings >> General >> Device Management
You should see the app listed at that screen. Tap on it.
Tap "Trust Projeccions i PDC Media S.L."
Now PDC Global will start downloading its contents.