I subscribe for early map access and receive a notification when they are available. I click on the notification and click OK to download the map. I then get a message saying Navigator has stopped. If I click OK it gives the same message before closing the app. If I then open Navigator I get a message saying it is checking file integrity then after 30 seconds or so the app opens. I can then choose Map Manager & download the maps. This has only started happening since the October map updates.
Navigator for Android on Motorola Moto G running KitKat 4.4.4
close Navigator and delete data in Android settings/application manager/Navigator - then reboot your phone. If this does not help, please email logs (navigator/log folder).