iPhone app could not be installed at this time

Question

i was trying to install my iphone application from testflight. it installs perfectly on few devices but in some after installing about 80 percent it gives an error \"Unable to d

Answer 1

Watch the console through the Xcode Organiser for the device that is failing to install.

You'll get a helpful message from the system telling you what is wrong. There are lots of potential failure reasons, so unless you check the message, you're just guessing...