You can download the app by visiting this page using your mobile phone that is connected to your watch.
Or:

1. Open the fitbit app on your phone
2. Go to Account
3. Click on your watch
4. click "Apps"
5. click "All Apps"
6. click "Search Icon"
7. Type "Golf gps"
8. Click on on my
9. click "Install"

Fitbit App Gallery