Hi, So, this post actually helped me as I had the same issue.
As far as I can tell, you need to:
1. Ensure that the car is connected and telematics enabled.
2. Ensure that you have an account and your app on your phone is fully configured and connected to your car.
3. After connecting your car to your mobile Wifi (seems to only work with my mobile hotspot for some reason), in your car, go to App Centre and ensure that your account is registered (enter in your email address and password
4. Once all the above is done, if the app is not on there, you will need to
http://globalappcenter.com, log in using the same details, you will see your apps there, including the fish, click on purchase and click to the end. This will not charge you anything (at the moment)
5. Once done, go to your car, ensure that its on wifi, go to the app centre and you will notice that there's nothing there initially. To trigger the download, go to the profile details and change the country to your country. Do this even if you have done this before.
6. The above will then trigger a download and restore your app that you could then install.
All set!
I hope this helps you and others. I had a hard time working out what needs to be done as there's nothing online really explains what we need to do if the fish go missing
Enjoy!