Mark,
If you are not already in the Engine Driver beta program...
Go to the Play Store, find the Engine Driver app page, you will see link/button to join the beta program. Just click on that and follow any instructions.
It sometimes takes a few minutes to activate..
I am pretty sure that the beta version will automatically install after a little while, but you may need to click on the install /update button.
Peter?
(Brisbane Australia)?
Peter Akers