Cant even download game data??

I am transferring my account to a new device and it wont even let me download the game data. It will always error out saying the download failed midway through, forcing me to restart my download all over again (and eventually fail again). I dont have the best internet in the world, but that shouldnt stop me from playing this game.

Hikilaka about DRAGON BALL Z DOKKAN BATTLE, v3.0.1