Note that there are multiple SwiftKey Keyboard versions available for different Android operating systems. Choose APK depending on your device OS.
For Android 6.0+ (Marshmallow, Nougat):
6.5.1.44
Download
For Android 4.0.3+ (Ice Cream Sandwich, Jelly Bean, KitKat, Lollipop & above):
6.5.1.44
Download