• Just open the Play Store app on your phone or tablet.Search for 'Engine Driver Throttle'. 
• Scroll down to near the bottom of the page where it talks about being a beta tester, and click 'I'm in'.
• Wait about 3-5 minutes. 
• Go back to the same page.
• The title should now be 'Engine Driver Throttle (beta)' and click 'Update' (or 'Install' if you have not installed it previously).  

The current beta is 1.18.1 which fixes a few small visual bugs and a problem downloading the app if you have an ESU MCII controller. 

You can make comments, or report problems about the beta version of app through the Play Store.  Only the lead developer will see the comments.