Board Thread:Questions and Answers/@comment-30463800-20161109194936/@comment-27247829-20161110002856

You are downloading the wrong version. Click link below for details:

http://fategrandorder.wikia.com/wiki/How_to_Download_and_Play_the_Game

Basically, check the developer first; download the one from Aniplex, the one without the blue logo in the corner of the app's icon.