for all the other games usually asks to give the consent before starting the game, but this time is different, anyway I will try this way, thank you.It must be because the system refuses to launch an app whose origin is unknown (unknown to Apple) Right-click on the app and choose "cancel", do it a second time and choose "open", it should launch.
[Edit] I've modified my post, what I first wrote was inaccurate.
P.S ( sorry eventually for my English but It's not my first language )