title: Google Play - Package File is Invalid
body: <p>I've developed an app a while ago and already uploaded it to google play a few months ago. It has about 2000 downloads at the moment and it seems to work fine for everyone.</p>
  
  <p>But today someone sent me an email, I'm quoting him:</p>
  
  <blockquote>
    <p>I really wanted this app. but when I started downloading it I got the error message "package file is invalid". I thought this was my fault so I went and downloaded some other stuff which all downloaded fine. so I am hoping you nay be able to fix it! I have a sg3, version 4.1.2 and if you need more information, I will assist in any way!</p>
  </blockquote>
  
  <p>I've recently (2 days ago) release an update for the app, it's been two days and the statistics say that no one downloaded the update yet. </p>
  
  <p>I did some research and it says that this problem is caused by the user, not by the developer. Could anyone tell me if this can be fixed by me? Or should I tell him to clear his cache etc.?</p>
  
  <p><a href="https://play.google.com/store/apps/details?id=com.matthewstudios.gw2legendary" rel="nofollow">This is the app,</a> if anyone could take his time and download it just to see if it works :) thank you!</p>
  
  <p>Keystore is not expired:</p>
  
  <blockquote>
    <p>Certificate expires on Wed Oct 14 22:17:12 CEST 3012</p>
  </blockquote>
  
  <p>Also, I just asked my friend, that also has Samsung Galaxy S3 to try downloading it and he says it works good. So I'm pretty sure the problem isn't in the app, but in this user's phone. Any suggestions what I should tell him to try fixing?</p>