title: Upload error: Do not have last keystore for Android app
body: <p>An app is built by another developer they don't have a key file. I know there is no way to get back key store. This is the error message shown to me when I updating old APK to new APK:</p>
  
  <p><img src="https://i.stack.imgur.com/11m2b.png" alt="Image"></p>
  
  <p>Is it possible to unpublish old app and republish the new app with the same package name, version code, and version name?</p>
  
  <p>I want to known that the users will get an update for the app or not. Is there any other way to solve this issue?</p>