title: Testflight unable to install an app
body: <p>I have several tester who have registered to testflight and connected their devices... they have different ios models... iOS 6 and above... but all of them share the same problem.</p>
  
  <p>When they click the install button of an app from "safari" or the "testflight" app itself...</p>
  
  <p>the app starts to download... reaches about 90% and an error message appears...."UNABLE TO DOWNLOAD APPLICATION. the "app" could not be installed at this time.</p>
  
  <p>Now i have about 30 testers... 7 of them have the same issue... the others have succesfuly installed the app with no problem what so ever... </p>
  
  <p>It seems completely random bug to me as there are no correlations between the phone models or ios versions... which are by the way all 6 and above....</p>
  
  <p>So... what do i do. please help</p>