I'm sorry you're having trouble downloading the game! We don't require special permissions to download the file, so the error is a little hard to figure out. Can you try downloading the Itch.io App and then downloading the game through the app? Sometimes that helps get past blocks. The game is also large so perhaps it's not allowed on your phone because of a space issue and freeing up someone memory would make it more doable. Also sometimes an initial download just goes strange and then later downloads don't work because of that. So closing everything, making sire something nothing is running in the background, giving it a few minutes, and then trying would have it again might go more smoothly.
Let me know if anyone of that helps!