Fortnite won’t launch. How to fix it? [Mac OSX/MacBook pro]

[Last verification: 2020/07/19 v13.20 ]

[Solution]
Just update the Mac OSX to 10.15 (Catalina).
With 10.14 (Mojave), it seems not to work.

[Details]
Shortly after Chapter 2 started (end of 2019), Fortnite could not be started on Mac (MacBook pro 2016, os 10.14). I could even install Epic Games Launcher. However, when I started Epic Games Launcher, the screen layout was strange, even if I selected the Fortnite, the game didn’t start.
After updated to OSX 10.15, it did work.