Try rebooting your iPad then check storage used. It doesn’t always update straight away.
admin the storage isn’t a problem. I have plenty space and still at 80% it stops downloading. First time I thought it lost connection to your server but for the second time it was the same (80% and stopped) but this time it said “Thank you for buying HiRes Aerial Images. Enjoy your new region” and now it says “Installed” under it. I’m sorry but this is BS. iPad settings are saying that Aerofly takes only 3.88GB for the app and 3.6GB for the Documents and Data (which is Switzerland).
In my opinion it was a pain at first. The game kicked me out multiple times. At one point it even said installed but nothing had changed and said buy again. I was able to get it to work by restarting my iPhone and was able to get it to download. When I was able to get it to work it stopped at 80% then finished. I think 80% is when the package installs so it could take some time and may sometimes cause the game to crash.