If the additional download remains stuck at 0%, this is normally just a visual bug. The download will still take place in the background, so all you have to do is wait.
If the problem persists, here are a few tips:
- Uninstall the application completely
- Install the application from the play store
- Don't launch the application straight away (even after downloading and installing it)
- Wait about the same amount of time it took to install the application (or even an hour, to be on the safe side), while maintaining a stable connection
- Only then launch the application
A future update should solve this problem, but for the moment we have no visibility of when that will be! As soon as we know, this article will be updated.