Great News!!!
or just the differences between them are local navigation (drive) vs worldwide (drive+) navigation
I had the same problem. Received notification of update for HERE Drive + (Beta), accepted the update, then, the app kept crashing on start-up and closing as well, eventually, coming back to the start screen of my Lumia 920. I un-installed the Here Drive, and tried to re-install later, unfortunately, received a message saying that "This app is not available for your device".
Any clue how to get the app back, it was quite nice app to have.