title: How to update app with Google Play and force download
body: <p>I'm using android studio. I have developed an app and now I want to upload it to Google Play. I have a license and I have uploaded an app before, but I didn't really know what I was doing at that time.</p>
  
  <p>What I want is to upload my app to Google Play, and then upade it without losing the reviews and rating. How do I do that?</p>
  
  <p>And, what is the best way to force a user to download an update? I am going to upload the app to Google Play and to Amazon Appstore (for android), so a link to Google Play or something similar is maybe not the best solution. I was thinking - a toast message "please update the app". What do you think?</p>