iOS Application Installation process:
In order to install an app on iOS device, select the desired device and connect to the device.
Before installing any IPA file on any of the iOS device, please follow any of the below steps:
1) You can Resign your app (test ipa) by using pcloudy platform Click Here
2) You can add iOS device UDID in your developer profile Click Here
Go to the right pane -> Click on "Install", a dialog box opens up.
Select the desired IPA file and click on install.