Dependent on your device, go to the Google Play Store, The Apple App Store, or the Widows-Microsoft App Store and tap on Search. 

Enter CarryMap and tap on Search

The CarryMap icon is a multi-colored four leaf clover: 

Tap on Get (App Store/Windows App Store)or Install (Play Store)

Verify the CarryMap app has been loaded onto your device before downloading the Mobile Map file(s)