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)